A writer can sleep forever in zstd_get_workspace() even though a workspace
is free. When zstd_alloc_workspace() fails, the task is queued on
zwsm->wait and schedules unconditionally, never re-testing the pool.
zstd_put_workspace() publishes the workspace and then calls cond_wake_up(),
which only wakes when a sleeper is already visible, so a workspace returned
between the failed allocation and prepare_to_wait() wakes nobody. The
window is wide: zstd_alloc_workspace() goes through kvmalloc() and may
enter reclaim.
Only a max level workspace triggers the wakeup and one is deliberately kept
allocated as the fallback every waiter waits for, so once its wakeup is
lost the writer stays in TASK_UNINTERRUPTIBLE until some other task happens
to return one. Re-check the pool after prepare_to_wait() has published the
waiter, and use the workspace if one turned up.
Fixes: 3f93aef535 ("btrfs: add zstd compression level support")
Assisted-by: Claude:claude-opus-5
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: FAN YE <fy15309206903@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
[BUG]
When running btrfs/252 with quota enabled through MKFS_OPTIONS="-O quota",
it has a high chance to trigger the following kernel warning and flips
the fs RO:
BTRFS info (device dm-2): relocating block group 30408704 flags metadata|dup
------------[ cut here ]------------
WARNING: fs/btrfs/extent-tree.c:879 at lookup_inline_extent_backref+0x74b/0x960 [btrfs], CPU#4: btrfs/2173
CPU: 4 UID: 0 PID: 2173 Comm: btrfs Not tainted 7.2.0-rc6-custom+ #457 PREEMPT(full) 3adc6528fb66f7a55fe1095385818e742f200aab
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS unknown 02/02/2022
RIP: 0010:lookup_inline_extent_backref+0x74b/0x960 [btrfs]
Call Trace:
<TASK>
insert_inline_extent_backref+0x7c/0x160 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
__btrfs_inc_extent_ref+0xa9/0x270 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
__btrfs_run_delayed_refs+0x4af/0x11c0 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
btrfs_run_delayed_refs+0x9d/0xf0 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
create_pending_snapshot+0x39d/0xf00 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
create_pending_snapshots+0x9b/0xc0 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
btrfs_commit_transaction+0x280/0xeb0 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
prepare_to_relocate+0x147/0x200 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
relocate_block_group+0x6b/0x5e0 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
btrfs_relocate_block_group+0x92c/0x2380 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
btrfs_relocate_chunk+0x3f/0x1a0 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
btrfs_balance+0xa2c/0x19c0 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
btrfs_ioctl+0x2839/0x2d30 [btrfs 32f09462c54d9c922fca74a3e4866f4aa7737b72]
__x64_sys_ioctl+0x416/0x9a0
do_syscall_64+0xe1/0x790
entry_SYSCALL_64_after_hwframe+0x4b/0x53
</TASK>
---[ end trace 0000000000000000 ]---
BTRFS info (device dm-2): leaf 4593991680 gen 233 total ptrs 175 free space 5953 owner 2
BTRFS info (device dm-2): refs 3 lock_owner 2173 current 2173
item 0 key (166772736 METADATA_ITEM 1) itemoff 16250 itemsize 33
extent refs 1 gen 222 flags 2
ref#0: tree block backref root 266
[ Skip the tree dump ]
item 174 key (263225344 METADATA_ITEM 0) itemoff 10328 itemsize 33
extent refs 1 gen 162 flags 258
ref#0: tree block backref root 267
BTRFS error (device dm-2): extent item not found for insert, bytenr 179847168 num_bytes 16384 parent 4594335744 root_objectid 273 owner 0 offset 0
BTRFS error (device dm-2): failed to run delayed ref for logical 179847168 num_bytes 16384 type 182 action 1 ref_mod 1: -117
[CAUSE]
The above error is showing that there is a tree reference to a metadata
extent that is no longer there.
With "ref_verify" mount option (requires CONFIG_BTRFS_DEBUG), there is
some extra debug output:
BTRFS error (device dm-2): dumping block entry [180961280 16384], num_refs 0, metadata 1, from disk 0
BTRFS error (device dm-2): root entry 256, num_refs 18446744073709551615
BTRFS error (device dm-2): root entry 273, num_refs 18446744073709551615
BTRFS error (device dm-2): Ref action 3, root 273, ref_root 273, parent 0, owner 0, offset 0, num_refs 1
btrfs_force_cow_block+0x129/0x7d0 [btrfs]
btrfs_cow_block+0x10a/0x250 [btrfs]
btrfs_search_slot+0x5eb/0xf40 [btrfs]
btrfs_insert_empty_items+0x3a/0x70 [btrfs]
insert_with_overflow+0x53/0x130 [btrfs]
btrfs_insert_dir_item+0x125/0x290 [btrfs]
btrfs_add_link+0xaa/0x410 [btrfs]
btrfs_rename+0x5ea/0xcd0 [btrfs]
btrfs_rename2+0x28/0x60 [btrfs]
vfs_rename+0x5b2/0xe10
filename_renameat2+0x244/0x430
__x64_sys_rename+0x48/0x70
do_syscall_64+0xe1/0x790
entry_SYSCALL_64_after_hwframe+0x4b/0x53
BTRFS error (device dm-2): Ref action 2, root 273, ref_root 273, parent 0, owner 0, offset 0, num_refs 18446744073709551615
btrfs_force_cow_block+0x327/0x7d0 [btrfs]
btrfs_cow_block+0x10a/0x250 [btrfs]
btrfs_search_slot+0x5eb/0xf40 [btrfs]
btrfs_lookup_file_extent+0x4d/0x70 [btrfs]
btrfs_drop_extents+0x151/0xf00 [btrfs]
insert_reserved_file_extent+0xfe/0x3e0 [btrfs]
btrfs_finish_one_ordered+0x549/0xc40 [btrfs]
btrfs_work_helper+0xde/0x350 [btrfs]
process_one_work+0x198/0x380
worker_thread+0x1c8/0x330
kthread+0xee/0x120
ret_from_fork+0x28f/0x310
ret_from_fork_asm+0x11/0x20
BTRFS error (device dm-2): Ref action 1, root 273, ref_root 0, parent 4594335744, owner 0, offset 0, num_refs 1
__btrfs_mod_ref+0x1c5/0x2d0 [btrfs]
btrfs_copy_root+0x262/0x390 [btrfs]
create_reloc_root+0xb9/0x370 [btrfs]
btrfs_init_reloc_root+0xb0/0x1b0 [btrfs]
record_root_in_trans+0xa6/0xd0 [btrfs]
create_pending_snapshot+0x383/0xf00 [btrfs]
create_pending_snapshots+0x9b/0xc0 [btrfs]
btrfs_commit_transaction+0x280/0xeb0 [btrfs]
prepare_to_relocate+0x147/0x200 [btrfs]
relocate_block_group+0x6b/0x5e0 [btrfs]
btrfs_relocate_block_group+0x92c/0x2380 [btrfs]
btrfs_relocate_chunk+0x3f/0x1a0 [btrfs]
btrfs_balance+0xa2c/0x19c0 [btrfs]
btrfs_ioctl+0x2839/0x2d30 [btrfs]
__x64_sys_ioctl+0x416/0x9a0
do_syscall_64+0xe1/0x790
The above shows the direct cause, Ref action 3 is the oldest operation,
which shows the tree block is created by COW. Then ref action 2 shows
it's COWed away, by a metadata update, meaning the tree block is already
released, should not be referred any more.
Then the final one, is trying to create a reloc tree for subvolume 273,
and that reloc root creation is referring to the already dropped tree
block.
The root cause is that, during qgroup_account_snapshot(), we are calling
record_root_in_trans() with "force = true".
So if the root has no reloc root, we will create one, but at that
timing it's already too late.
Normally reloc root should be created before the commit and current
roots diverge, to avoid the same problem we are hitting.
But during relocation initialization, we are committing the current
running transaction, with a new reloc_control attached halfway.
And if qgroup is enabled, the record_root_in_trans() with "force = true"
calls will force reloc root creation even if we do not and should not
create reloc root at that timing.
[FIX]
Do not force reloc root creation during record_root_in_trans() with
"force = true" cases, which is only called by qgroup_account_snapshot().
If we're really under relocation, the reloc root should be created way
early, before the commit and current root diverge. If the root has no
reloc tree yet, it means we're still initializing the reloc, and do not
need a reloc root.
So skipping the reloc tree creation in qgroup_account_snapshot() should
be safe.
Link: https://bugzilla.suse.com/show_bug.cgi?id=1275740
Fixes: 4d31778aa2 ("btrfs: qgroup: Fix root item corruption when multiple same source snapshots are created with quota enabled")
Assisted-by: LLM (initial analysis, but incorrect conclusion with too many burnt tokens)
Tested-by: Disha Goel <disgoel@linux.ibm.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The direct-return refactoring in commit b3047a42f5 ("btrfs: send:
directly return from will_overwrite_ref() and simplify it") changed
will_overwrite_ref() to return directly instead of going through the
common out label.
That resulted in a negative return value from is_inode_existent() to
start being converted to 0, making lookup errors unable to be
distinguished from the inode not existing.
process_recorded_refs() expects negative errors from
will_overwrite_ref() and aborts processing when it receives one.
Return the value from is_inode_existent() to restore the previous error
propagation behavior as it was before the refactor.
Fixes: b3047a42f5 ("btrfs: send: directly return from will_overwrite_ref() and simplify it")
Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
When transaction metadata writeout fails in btrfs_commit_transaction(),
the current code only logs the error, drops tree_log_mutex and then goes
through cleanup_transaction(), which aborts the transaction and records
the fs error.
That is too late for the tree log side. A log sync can already be
waiting on tree_log_mutex, because the committing transaction is moved
to TRANS_STATE_UNBLOCKED while that mutex is held, which lets fsyncs
join the next transaction and queue up in btrfs_sync_log(). Once the
failed commit drops tree_log_mutex, such a log sync acquires it, sees
BTRFS_FS_ERROR() still clear, and writes super_for_commit. That
superblock holds the roots prepared for the transaction that has just
failed to write out its metadata, so it can point at tree blocks that
never reached the disk, and the next mount fails with a parent transid
mismatch.
Commit 165ea85f14 ("btrfs: do not write supers if we have an fs
error") fixed this class of problem by making btrfs_sync_log() check for
an fs error right after taking tree_log_mutex. That check only works if
the commit path publishes the fs error before it releases the same
mutex, and commit 68d4ece9c3 ("btrfs: don't call
btrfs_handle_fs_error() in btrfs_commit_transaction()") removed the only
thing that did so.
Restore the ordering by aborting the transaction while tree_log_mutex is
still held. We have a transaction handle here, so this does not need to
bring back the btrfs_handle_fs_error() call: __btrfs_abort_transaction()
records the fs error itself, which is all btrfs_sync_log() looks at, and
the error message put in its place is kept.
This is what commit 3810ab40af ("btrfs: abort transaction on error in
write_all_supers()") already does for the next call in this function.
This is reproducible on an unmodified kernel by failing the first
couple of bios of a transaction commit with fail_make_request while a
concurrent fsync workload keeps log syncs queued on tree_log_mutex.
Fixes: 68d4ece9c3 ("btrfs: don't call btrfs_handle_fs_error() in btrfs_commit_transaction()")
CC: stable@vger.kernel.org # 7.0+
Reviewed-by: Boris Burkov <boris@bur.io>
Reviewed-by: jlayton@meta.com <jlayton@meta.com>
Signed-off-by: Leo Martins <loemra.dev@gmail.com>
Reviewed-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
btrfs_zone_finish_endio() ignored the return value of do_zone_finish()
and always returned 0, silently dropping a failed zone finish.
Instead propagate any error from do_zone_finish() as the caller
btrfs_finish_ordered_io() already handles it.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
do_zone_finish() clears BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE before finishing
the zones. If call_zone_finish() then fails it returned early, leaving the
now inactive block group on fs_info->zone_active_bgs, leaking its
reference, the BTRFS_FS_NEED_ZONE_FINISH waiters are never woken, and as
its alloc_offset equals the zone capacity btrfs_zone_finish_one_bg() keeps
selecting it, spinning btrfs_zoned_activate_one_bg().
Fall through to the cleanup on failure too and return the error, but keep
the block group read-only as its zones are left inconsistent.
Fixes: d70cbdda75 ("btrfs: zoned: consolidate zone finish functions")
Link: https://sashiko.dev/#/patchset/20260818100037.1366563-1-johannes.thumshirn%40wdc.com
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: David Sterba <dsterba@suse.com>
[BUG]
A corrupted subvolume tree can leave an EXTENT_DATA item attached to an
inode whose mode is not S_IFREG or S_IFLNK. During send, such an item can
be treated as file data and crash through a NULL address_space operation:
BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
Call Trace:
<TASK>
read_pages+0x80b/0xb30 mm/readahead.c:173
page_cache_ra_unbounded+0x40d/0x890 mm/readahead.c:302
do_page_cache_ra mm/readahead.c:332 [inline]
page_cache_ra_order+0xa16/0xcd0 mm/readahead.c:535
page_cache_sync_ra+0x5ce/0x9d0 mm/readahead.c:626
page_cache_sync_readahead include/linux/pagemap.h:1379 [inline]
put_file_data fs/btrfs/send.c:5224 [inline]
send_write fs/btrfs/send.c:5291 [inline]
send_extent_data+0x16b2/0x29b0 fs/btrfs/send.c:5715
send_write_or_clone fs/btrfs/send.c:6135 [inline]
process_extent+0x5d4/0x17b0 fs/btrfs/send.c:6504
changed_extent fs/btrfs/send.c:7079 [inline]
changed_cb+0x22f9/0x3cd0 fs/btrfs/send.c:7245
full_send_tree fs/btrfs/send.c:7318 [inline]
send_subvol fs/btrfs/send.c:7910 [inline]
btrfs_ioctl_send+0x46a9/0x57f0 fs/btrfs/send.c:8248
...
[CAUSE]
process_extent() skips extent items for symlinks but assumes every other
inode with an extent item is a regular file. For a corrupted non-regular
inode, btrfs_iget() does not install the regular file address_space
operations. The readahead fallback can then call a NULL read_folio
callback before the existing validation in btrfs_get_extent() can run.
[FIX]
Reject extent items for inode types other than regular files and symlinks
at the common send extent-processing boundary. Symlink handling is left
unchanged because send emits symlink data from read_symlink(). This covers
full, incremental and new-generation sends without adding a check to the
regular I/O path.
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: ZhengYuan Huang <gality369@gmail.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
The function btrfs_abort_transaction() only accepts negative error code,
and have the macro VERIFY_NEGATIVE_ERROR() to verify that error code.
But inside update_raid_extent_item(), if there is such key found, we
return 1, breaking the negative error code scheme.
Furthermore if we hit some real error during the tree search, e.g. -EIO,
then the error code is always over-written to -EINVAL.
Fix both problems by following other call sites by overwriting @ret to
-ENOENT if the btrfs_search_slot() failed to locate the key.
This is very unlikely to hit, as we only enter update_raid_extent_item()
if there is a conflicting key already in the raid stripe tree.
This was reported by Sashiko when reviewing another patch.
Link: https://sashiko.dev/#/patchset/20260817021512.3010812-1-shuangpeng.kernel%40gmail.com
Fixes: 8c4cba2adb ("btrfs: update stripe extents for existing logical addresses")
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
There are two possible ways to leak bioc memory on
btrfs_ordered_extent::bioc_list:
- An error occurred for btrfs_insert_one_raid_extent()
Then the function btrfs_insert_raid_extent() immediately return
without freeing any bioc in the bioc_list.
- An ordered extent hit an IO error
In that case the ordered extent will have BTRFS_ORDERED_IOERR set, and
skip the call on btrfs_insert_raid_extent() completely.
Fix the problem by:
- Introduce a new helper, btrfs_cleanup_ordered_bioc_list()
Which will remove all bioc from the bioc_list, and release the bioc.
- Call the above helper for btrfs_insert_raid_extent()
So that the cleanup helper is always called no matter what.
- Call the above helper for btrfs_finish_one_ordered()
This is called just before the final release on the ordered extent.
This was reported by Sashiko when reviewing another patch.
Link: https://sashiko.dev/#/patchset/20260817021512.3010812-1-shuangpeng.kernel%40gmail.com
Fixes: 02c372e1f0 ("btrfs: add support for inserting raid stripe extents")
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
If allocation of a RAID stripe extent fails,
btrfs_insert_one_raid_extent() aborts and ends the transaction before
returning -ENOMEM.
btrfs_finish_one_ordered(), the production caller through
btrfs_insert_raid_extent(), still owns the transaction handle. It handles
the error by aborting the transaction and then reaches the common exit
path, which ends the transaction again.
The premature end can free the handle and drop its transaction reference.
Transaction cleanup can then free the transaction before the caller's
second abort accesses the handle and transaction, resulting in
use-after-free.
Keep the abort at the failure site, but let the caller's common exit path
end the transaction once, after it has finished using both objects.
Fixes: 02c372e1f0 ("btrfs: add support for inserting raid stripe extents")
Assisted-by: Codex:GPT-5
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Shuangpeng Bai <shuangpeng.kernel@gmail.com>
Signed-off-by: David Sterba <dsterba@suse.com>
scrub_stripe_report_errors() iterates over the sectors of a stripe, but
every message it emits passes stripe->logical, the address of the first
sector of the 64KiB stripe, rather than the address of the sector being
reported. The physical address is likewise computed once, before the
loop, from stripe->logical.
This matters because scrub_print_common_warning() uses that logical
address for the backref walk which produces the "root %llu inode %llu
offset %llu ... (path: ...)" part of the message. As the address is
always the stripe base, the reported root/inode/offset/path can identify
a different file from the one whose sector actually failed.
A 64KiB stripe routinely spans several extents belonging to unrelated
files. On the machine where this was found, the stripe at logical
0x17D9380000 holds four sectors of /usr/share/plasma/emoji/bg.dict, then
a file inside a docker volume, then sectors referenced only by
snapshots. Every error anywhere in that stripe is attributed to bg.dict.
The effect is visible statistically: across ten months and four kernel
series that machine logged 81 distinct flagged logical addresses, and
every one of them is exactly 64KiB aligned. Since BTRFS_STRIPE_LEN is
64KiB and stripe->logical is stripe aligned by construction, real
failures distributed across sectors could not produce that.
Report the address of the sector actually being examined. Adding the
sector offset to the physical address is valid because BTRFS_STRIPE_LEN
is the unit contiguous on a single device for every profile, so a stripe
never crosses a device boundary.
Fixes: 0096580713 ("btrfs: scrub: introduce error reporting functionality for scrub_stripe")
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: James C. Owens <jamesowens@optonline.net>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
drm_pagemap_migrate_populate_ram_pfn() had two issues when populating
RAM PFNs with higher-order folios:
1. The higher-order vma_alloc_folio()/folio_alloc() calls did not pass
__GFP_NOWARN, so a THP allocation failure under memory pressure
would spam the kernel log, and there was no fallback path despite a
TODO comment stating one was needed. Add __GFP_NOWARN to the
higher-order allocation and, on failure, fall back to order-0
allocations for the entire range originally covered by the failed
higher-order allocation, leaving MIGRATE_PFN_COMPOUND unset for
those PFNs.
2. In the free_pages error path, order was computed via
folio_order(page_folio(page)) *after* put_page(page) had already
dropped the reference, resulting in a use-after-free/put when that
was the last reference on the page. Compute order before releasing
the page.
Introducing the fallback in 1. also requires the source page array
handed to ->copy_to_ram() to be built differently. Both callers only
populated the entry at the head of each source folio, relying on the
copy callback to derive the rest of the folio from the order recorded
in the matching drm_pagemap_addr. Once the destination has been demoted
to order-0 folios the drm_pagemap_addr entries are per-page, so a source
page is needed for every one of them; leaving them NULL makes the copy
callback stop after the first page and the remainder of the range is
never copied.
The source folio is only split later, by migrate_vma_pages() /
migrate_device_pages(), so its order cannot be used to detect the
demotion - test the destination for MIGRATE_PFN_COMPOUND instead. Factor
the array population out into drm_pagemap_migrate_populate_src_pages()
and use it from both drm_pagemap_evict_to_ram() and
__drm_pagemap_migrate_to_ram().
Fixes: ddeda61360 ("drm/pagemap: Allocate folios when possible")
Cc: stable@vger.kernel.org
Assisted-by: GitHub_Copilot:claude-opus-5
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patch.msgid.link/20260902063504.3024362-2-matthew.brost@intel.com
drm_pagemap_migrate_unmap_pages() relies on the pages array to determine
which pages require DMA unmapping. However,
drm_pagemap_migration_unlock_put_pages() clears the array as part of its
cleanup, leaving drm_pagemap_migrate_unmap_pages() with no valid page
information if it is called afterward.
Call drm_pagemap_migrate_unmap_pages() before
drm_pagemap_migration_unlock_put_pages() so the pages array remains
valid during DMA unmapping.
Reported-by: Sashiko <sashiko-bot@kernel.org>
Fixes: f86ad0ed62 ("drm/gpusvm, drm/pagemap: Move migration functionality to drm_pagemap")
Cc: stable@vger.kernel.org
Signed-off-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Link: https://patch.msgid.link/20260902063504.3024362-1-matthew.brost@intel.com
The options files do not take the trace_array reference for the options
they represent. This could cause a use-after-free kernel crash if one of
these files is opened by one task and another task removes the instance
that the option is for. Because it doesn't take a reference upon opening,
it will not stop the removal which will free the options descriptor that
is being used.
As the options are somewhat dynamic in their creation at boot up, each
file represents a flag in the trace_array. The trace_array has an array of
indexes to represent each of these flags that is stored in the
trace_flags_index array. The address of the index array element is used to
pass to the inode->i_private pointer. Then that element is read which
holds the index (which represents the flag) and then the index is used to
calculate the trace_array descriptor from its trace_flags_index array.
One issue is that the index element can not be referenced until the
trace_array's reference is taken. To handle this, create a new helper
function called: trace_array_options_get() that will iterate all the
existing trace_arrays in the ftrace_trace_arrays list (under the
trace_types_lock), and compare the passed in address of the index element
with the entire array of the trace_array's trace_flags_index array.
If it matches, then up the corresponding trace_array's reference and
return.
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902121918.5a9e9d1b@gandalf.local.home
Fixes: 577b785f55 ("tracing: add tracer dependent options to options directory")
Reported-by: sashiko-bot@kernel.org
Closes: https://lore.kernel.org/linux-trace-kernel/20260828135858.2AC501F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
DCE can support PREMULTI and COVERAGE blend mode depending on its
generation, however current driver implementation either doesn't expose
more than primary and cursor plane, or doesn't program registers for any
blend mode other than PIXEL_NONE. To fix the missing-blend-mode-prop
warning according to current DCE plane caps, create blend mode property
with PIXEL_NONE and PREMULTI for primary planes. As long as the
background is black and there is no overlay plane, PIXEL_NONE and
PREMULTI are equivalent, and PREMULTI has been the mandatory/default
mode for years, so keep it to avoid regressions.
Fixes: 860e748bdd ("drm: ensure blend mode supported if pixel format with alpha exposed")
Tested-by: Viktor Jägersküpper <viktor_jaegerskuepper@freenet.de>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com> #v3
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Leandro Ribeiro <leandro.ribeiro@collabora.com> #v2
Signed-off-by: Melissa Wen <mwen@igalia.com>
Link: https://patch.msgid.link/20260826104143.39077-4-mwen@igalia.com
validate_blend_mode_for_alpha_formats() warns when a plane supports
formats with alpha but doesn't expose the blend mode property. Fix this
by adding the same overlay plane blend modes to primary plane, since
they are all universal planes in DCN-generation. Cursor planes support
ARGB8888 format and CURSOR_MODE_COLOR_PRE_MULTIPLIED_ALPHA is set by
default (other color formats are not implemented), so only expose
support to PREMULTI, which is the default blend mode on DRM.
Fixes: 860e748bdd ("drm: ensure blend mode supported if pixel format with alpha exposed")
Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Link: https://patch.msgid.link/20260826104143.39077-3-mwen@igalia.com
In __drm_atomic_helper_plane_state_init(), pixel_blend_mode is always
reset to DRM_MODE_BLEND_PREMULTI. That was consistent while
drm_plane_create_blend_mode_property() required PREMULTI in the
supported modes, but it now falls back to COVERAGE or PIXEL_NONE when
the driver doesn't support PREMULTI. The hardcoded default may therefore
not be a blend mode the hardware can do, nor one the property
advertises.
Initialize pixel_blend_mode from the blend mode property default
instead, keeping DRM_MODE_BLEND_PREMULTI for planes without the
property.
Fixes: 9813e158d1 ("drm/drm_blend: allow blend mode property without PREMULTI")
Tested-by: Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Alex Hung <alex.hung@amd.com>
Reviewed-by: Leandro Ribeiro <leandro.ribeiro@collabora.com>
Signed-off-by: Melissa Wen <mwen@igalia.com>
Link: https://patch.msgid.link/20260826104143.39077-2-mwen@igalia.com
CIFSSMBRead() reads DataLengthHigh, DataLength and DataOffset out of
the READ_RSP returned by the server without first checking that a
whole READ_RSP was actually received. The length of the response is
recorded in rsp_iov.iov_len, but nothing constrains it to be at least
read_rsp_size before those fields are dereferenced.
A malicious or compromised SMB1 server can return a response shorter
than the READ_RSP header, so that parsing the header itself reads past
the end of the receive buffer. SMB1 is not negotiated by default;
reaching this code requires an explicit vers=1.0 mount.
Reject the response unless it is at least read_rsp_size bytes long.
Fixes: 1da177e4c3 ("Linux-2.6.12-rc2")
Suggested-by: Paulo Alcantara <pc@manguebit.org>
Cc: stable@vger.kernel.org # 6.19.x
Assisted-by: Bynario AI
Signed-off-by: Diego Oliva <diego@bynar.io>
Reviewed-by: David Howells <dhowells@redhat.com>
Signed-off-by: Paulo Alcantara <pc@manguebit.org>
The following BPF program was erroneously accepted by the verifier:
static int cb(int i, __u64 *ctx)
{
/* unsafe on a second iteration */
small_arr[*ctx] = i;
*ctx = 100500;
return 0;
}
int main(void *ctx)
{
int nr_loops = 1;
u64 ctx = 0;
if (unlikely(bpf_get_prandom_u32() == 42))
nr_loops = 2;
bpf_loop(nr_loops, cb, &ctx, 0);
return 0;
}
The branch with nr_loops == 1 was explored first and injected a
checkpoint at the entry to 'cb', such that nr_loops in the main's
frame was not marked as precise. This checkpoint pruned the state with
nr_loops == 2 and the program was accepted.
This test case corresponds to the program above.
Entry point is written in assembly to ensure branch processing order.
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260831-bug-015-backtrack-cb-args-precise-v1-2-68a8e2a821e0@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
When processing calls to bpf_loop() verifier marks R1 (and R4) as
precise. R1 tracks loop iterations number and because of the
'callback_depth < R1' mechanics in check_helper_call() must be marked
precise. However, precision propagation for R1 was broken,
when bpf_loop() call was verified on a second iteration.
Consider the following verification trace:
- main: bpf_loop(nr_loops, callback ...)
- callback: BPF_EXIT
- main: bpf_loop(nr_loops, callback ...)
- ...
While the first visit of the call to bpf_loop() propagated R1
precision as expected, the second call to mark_chain_precision() in
the check_helper_call() set R1, but it was immediately reset when
backtrack_insn() processed preceding BPF_EXIT in the loop deleted in
this patch.
Because of that, the second visit of the call to bpf_loop() injected
checkpoint with R1 not marked as precise. Which could trick the
verifier into accepting unsafe programs. See the next patch for an
example of such program.
Commit is structured in a way to minimize conflicts when
'bpf' would be eventually merged with 'bpf-next'.
Fixes: ab5cfac139 ("bpf: verify callbacks as if they are called unknown number of times")
Reported-by: Nicholas Carlini <npc@anthropic.com>
Suggested-by: Nicholas Carlini <npc@anthropic.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Link: https://lore.kernel.org/r/20260831-bug-015-backtrack-cb-args-precise-v1-1-68a8e2a821e0@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
On the Acer Aspire A515-57G (PCI SSID 1025:1616), if headphones are
already inserted into the combo jack before the codec powers up (a cold
boot with the plug already seated), the impedance-based headset-type
sensing races and misclassifies the jack. This drives the wrong output
configuration and is audible as missing center-panned content (e.g.
vocals) while panned content plays normally.
A genuine physical unplug/replug after boot reliably fixes this by
forcing a fresh sense transient, which is a strong hint about the
underlying cause: the sensing hardware appears to need a settled,
freshly-triggered read rather than the one-shot classification done
during the normal HDA_FIXUP_ACT_INIT pass.
Add a machine-specific fixup that, on cold boot only (not S3/S4 resume,
which already gets its own re-check), waits briefly after the normal
init-time decision and then forces a fresh headset-mode classification
by resetting the cached mode and re-invoking the existing
alc_fixup_headset_mode() path -- mirroring what a manual replug already
does. The wait+recheck is skipped whenever the first pass already
determined nothing is plugged in, to avoid adding boot latency on the
common case.
Chain into the existing ALC256_FIXUP_ACER_SFG16_MICMUTE_LED fixup so
this quirk-table entry keeps providing mic-mute LED support alongside
the cold-boot headset fix.
Tested on kernel 7.1.9 by building the affected module standalone and
confirming cold boot with headphones pre-inserted plays correctly from
the very first sample, across multiple boots (including a full restart,
and headphones inserted mid-POST rather than before power-on), with no
crashes or warnings and no behavioral difference from a real
post-replug recovery.
Signed-off-by: Oleksandr Kovalov <oleksandr.kovalov.work@gmail.com>
Link: https://patch.msgid.link/20260902171305.3955-1-oleksandr.kovalov.work@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
We can jump straight into the copy loop if the kernel is compiled for a
hardware that natively supports misaligned access. The user copy
bandwidth improvement on K3 and Ascaolon is shown as below:
Misaligned user copy, size: 512B (offset: [0:15] except 0, 8)
BW Improvement | Write | Read |
K3 | 6.19% | 3.43% |
Ascalon | 10.0% | 11.4% |
Aligned user copy, size: 512B (offset: 0, 8)
BW Improvement | Write | Read |
K3 | 1.69% | 0.90% |
Ascalon | 1.25% | 3.32% |
Suggested-by: Anton Blanchard <antonb@tenstorrent.com>
Signed-off-by: Andy Chiu <tchiu@tenstorrent.com>
Link: https://patch.msgid.link/20260901192334.3543340-1-tchiu@tenstorrent.com
Signed-off-by: Paul Walmsley <pjw@kernel.org>
Enforce local fence for IB_WR_REG_MR to avoid spurious
FASTREG_VALID_MKEY async events during heavy invalidation
and registration activity.
Commit 69e8e429bc ("RDMA/irdma: Enforce local fence for LOCAL_INV WRs")
was very similar, but was not sufficient to prevent all occurrences
of these async events.
Fixes: b48c24c2d7 ("RDMA/irdma: Implement device supported verb APIs")
Signed-off-by: Jacob Moroni <jmoroni@google.com>
Link: https://patch.msgid.link/20260901160014.2026285-1-jmoroni@google.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Locked QP and CQ lookups from EQ interrupts can deadlock with
create-path XArray updates. If an interrupt arrives while the create
path holds the plain xa_lock, the lookup spins forever trying to
acquire the same lock.
Use IRQ-safe XArray helpers for all QP and CQ create-path updates,
including the GSI QP store and error paths. Initialize both arrays with
XA_FLAGS_LOCK_IRQ so sleeping allocations preserve interrupt state.
Fixes: 98df2aee14 ("RDMA/erdma: Hold CQ references when processing EQ events")
Fixes: a52eeff320 ("RDMA/erdma: Hold QP references for AE and CM processing")
Signed-off-by: Cheng Xu <chengyou@linux.alibaba.com>
Link: https://patch.msgid.link/20260828030344.88021-1-chengyou@linux.alibaba.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
ib_mad_complete_recv() initializes mad_recv_wc->rmpp_list and then runs
ib_mad_enforce_security() before linking recv_buf onto that list. On
failure it calls ib_free_recv_mad(), which only walks rmpp_list and frees
the ib_mad_private of every buffer found there. As the list is still
empty at that point, nothing is freed at all.
The caller cannot clean up either: ib_mad_recv_done() sets recv to NULL
right after ib_mad_complete_recv() returns, assuming the MAD layer took
ownership of the buffer. Every MAD that fails the PKey check therefore
leaks one ib_mad_private (about 300 bytes per IB port MAD, ~2K for OPA),
and a remote node can trigger this repeatedly by sending MADs with a
wrong PKey.
Link recv_buf onto rmpp_list right after the list is initialized, so the
error path has something to free.
Fixes: 47a2b338fe ("IB/core: Enforce security on management datagrams")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Link: https://patch.msgid.link/20260826073216.2367-1-lirongqing@baidu.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
megasas_make_prp_nvme() builds a command's PRP list in cmd->sg_frame, a
DMA pool buffer of instance->max_chain_frame_sz bytes, spending one
entry per NVMe page of the transfer plus one per page of the buffer for
the chain pointer. The loop runs until the transfer is described and
never checks the buffer bound.
max_hw_sectors comes straight from the MDTS the firmware reports for the
drive. On drives with a large MDTS the only thing keeping the list
inside the buffer was the block layer default of 1280 KiB, which needs
320 entries, which fit into a 4 KiB frame as that holds 512. But since
commit 9b8b84879d ("block: Increase BLK_DEF_MAX_SECTORS_CAP") that
default is 4 MiB, and such a transfer needs 1025 entries, so the list
runs a full page past the end of the frame:
sd 1:0:1:0: [sdb] tag#630 page boundary ptr_sgl: 0x00000000ba62d13f
BUG: unable to handle page fault for address: ff663bcb81e7c000
#PF: supervisor write access in kernel mode
#PF: error_code(0x0002) - not-present page
RIP: 0010:megasas_build_and_issue_cmd_fusion+0xeaa/0x1870 [megaraid_sas]
If the page after the frame happens to be mapped, the overrun does not
fault but silently corrupts the neighbouring pool entry, which is
another in-flight command's PRP list.
Cap max_hw_sectors at what the chain frame can describe, less one page
for transfers that do not start on a page boundary and so need one entry
more. This is the megaraid_sas counterpart of commit 04631f55af
("scsi: mpt3sas: Limit NVMe request size to 2 MiB"), but derives the
limit from max_chain_frame_sz rather than hardcoding it.
Cc: stable@vger.kernel.org
Fixes: 9b8b84879d ("block: Increase BLK_DEF_MAX_SECTORS_CAP")
Reported-by: Lukasz Magiera <me@magik.net>
Closes: https://lore.kernel.org/all/GPhsSM0vkgyIrs0DIZ62qeUZX7X4RxwQXVKiuvMx-lHQVSPDxpztUyQOGS0xikqvJ-Z94hMV-dW_5KN_0CX2hsfV7kTf_t0MTf6vdAAaSEc=@magik.net/
Reported-by: Mira Limbeck <m.limbeck@proxmox.com>
Closes: https://lore.kernel.org/all/d171cc76-bf25-48ce-b482-d344669dfc24@proxmox.com/
Suggested-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/all/yq17bmzd5jr.fsf@ca-mkp.ca.oracle.com/
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Closes: https://lore.kernel.org/linux-scsi/20260827182106.535D61F000E9@smtp.kernel.org
Link: https://patch.msgid.link/20260827175743.734593-1-t.lamprecht@proxmox.com
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>
The two array allocations are done unconditionally and only checked
afterwards, so if the counters allocation fails while the collection
allocation succeeds, the error path frees counters and the containing
struct but never frees resources->collection, losing the only pointer
to it.
Fixes: de7498147d ("RDMA/uverbs: Refactor flow_resources_alloc() function")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Link: https://patch.msgid.link/20260826073146.2203-1-lirongqing@baidu.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
There's some internal state that ftrace_ops needs to have set, but since
it can be declared outside of the ftrace.c code, it calls
ftrace_ops_init() on the ops in every global function. The issue is that
if two tasks call it on the same ops at the same time it is possible to
have the initialization of one corrupt the initialization of the other
call.
Create a ops_mutex to use to synchronize every initialization of the
ftrace_ops. The mutex is taken within checking the ftrace_ops flag that
states it was initializied but the flag is checked again after the mutex
has been taken. Checking first outside the mutex allows it to shortcut
having to take the mutex. But then the check needs to be done again after
the mute is taken in case of races.
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260902095501.6b59af20@gandalf.local.home
Fixes: f04f24fb7e ("ftrace, kprobes: Fix a deadlock on ftrace_regex_lock")
Reported-by: sashiko-bot@kernel.org
Close: https://lore.kernel.org/all/20260829025528.49A831F000E9@smtp.kernel.org/
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
scsi_bsg_uring_cmd() reads bsg_uring_cmd from the shared mmap'd SQE.
Userspace can change a field after we check it and before we use it.
request_len is the sharp case: it can grow past sizeof(scmd->cmnd) after
the bound check and overflow scmd->cmnd in copy_from_user().
READ_ONCE() the SQE fields we check or use into locals before use.
Fixes: 7b6d3255e7 ("scsi: bsg: add io_uring passthrough handler")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20260527105931.3950913-1-rc@rexion.ai
Signed-off-by: Rahul Chandelkar <rc@rexion.ai>
Co-developed-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Link: https://patch.msgid.link/20260817080730.967879-3-yangxiuwei@kylinos.cn
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>
Completion copied scmd->sense_len to the user response buffer without
honoring max_response_len. After a valid sense, the midlayer sets
sense_len to the real length (up to SCSI_SENSE_BUFFERSIZE), so a smaller
user buffer was overrun.
Fixes: 7b6d3255e7 ("scsi: bsg: add io_uring passthrough handler")
Cc: stable@vger.kernel.org
Signed-off-by: Yang Xiuwei <yangxiuwei@kylinos.cn>
Link: https://patch.msgid.link/20260817080730.967879-2-yangxiuwei@kylinos.cn
Signed-off-by: Martin K. Petersen (Oracle) <mkp@kernel.org>
If the dm-integrity device has the SB_FLAG_DIRTY_BITMAP flag set and the
user activates the device in the 'R' mode, a crash in dm_integrity_resume
happens because the function attempts to read the journal containing the
bitmap.
This patch makes dm-integrity skip any writes to the device in
dm_integrity_resume if the device is activated in the 'R' mode.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: 468dfca38b ("dm integrity: add a bitmap mode")
Cc: stable@vger.kernel.org
A test case checking that the verifier properly backtracks both
fallthrough and implicit subprogram exit paths modelled for
BPF_LD | BPF_ABS instruction.
Without the previous patch:
- the verifier did not call bt_subprog_enter() on the implicit
subprogram exit path;
- bpf_pseudo_call() branch in backtrack_insn() executed
'bpf_bt_set_frame_reg(bt, bt->frame - 1, i);' with bt->frame == 0;
- causing a segmentation fault.
Reported-by: Nicholas Carlini <npc@anthropic.com>
Suggested-by: Nicholas Carlini <npc@anthropic.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20260901-bug-016-backtrack-ld-abs-v1-2-59368f1be435@gmail.com
Nicholas Carlini reported a bug in precision backtracking mechanism
for BPF_LD | BPF_{IND,ABS} instructions. These instructions are
modelled as two branches:
- fallthrough;
- implicit exit from current subprogram.
The implicit exit case was not handled by the backtrack_insn()
function. When backtracking such a path backtrack_insn() did not
call bt_subprog_enter(), which meant that backtracking continued
manipulating precision marks in a caller frame, while looking at
instructions in a callee frame.
This lead to segmentation faults during verification (see the
selftest), or unsound state pruning.
Fixes: ee861486e3 ("bpf: Fix ld_{abs,ind} failure path analysis in subprogs")
Reported-by: Nicholas Carlini <npc@anthropic.com>
Suggested-by: Nicholas Carlini <npc@anthropic.com>
Signed-off-by: Eduard Zingerman <eddyz87@gmail.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Daniel Borkmann <daniel@iogearbox.net>
Link: https://lore.kernel.org/bpf/20260901-bug-016-backtrack-ld-abs-v1-1-59368f1be435@gmail.com
The snd_rawmidi_input_params() computes err for the three invalid mode
combinations and for resize_runtime_buffer(), applies the new framing
and clock type only when err is zero, and then returns 0 anyway. A
caller that asked for parameters the kernel rejected is told the change
succeeded, and the substream keeps its old buffer.
The open_mutex conversion turned the early returns into assignments.
It handled the output sibling correctly, which still returns err, and
left this one behind.
Fixes: 94b98194b6 ("ALSA: rawmidi: Take open_mutex around parameter changes")
Cc: stable@vger.kernel.org
Assisted-by: Claude:claude-opus-5
Signed-off-by: HyeongJun An <sammiee5311@gmail.com>
Link: https://patch.msgid.link/20260902125058.19499-1-sammiee5311@gmail.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
The umdbr field in struct bnxt_re_db_region returns the raw
unmapped PCI BAR address of the doorbell region. Avoid sharing
this field to the userspace. Change this to a reserved field
and stop populating it, keeping the ABI layout and size
unchanged for existing binaries.
Fixes: 1234a9d8ae ("RDMA/bnxt_re: Support doorbell extensions")
Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@broadcom.com>
Link: https://patch.msgid.link/20260824172443.33943-1-sriharsha.basavapatna@broadcom.com
Reviewed-by: Selvin Xavier <selvin.xavier@broadcom.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
In the client, if `init_path()` errors, the callee tries to clean up
with `rtrs_clt_close_conns()`. However, this can lead to calling the
event tracing code with `clt_path->kobj->name` being `NULL` and thus
causing a null pointer dereference when trying to copy from it.
This just adds a guard to check that the name is not `NULL` before
copying from it. The server appears to have a similar pattern.
Fixes: 5a93929d9f ("RDMA/rtrs-clt: Add event tracing support")
Fixes: c16762b7bf ("RDMA/rtrs-srv: Add event tracing support")
Reported-by: syzbot+1695193198994f4e7fed@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=1695193198994f4e7fed
Signed-off-by: Ryan Mehri <ryan.mehri1@gmail.com>
Link: https://patch.msgid.link/20260823034303.163403-1-ryan.mehri1@gmail.com
Reviewed-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
bnxt_re_init_dcb_wq() ignores a failed allocation. The async DCB
handler later calls queue_work() on the NULL pointer.
Fixes: 51dc5312dc ("RDMA/bnxt_re: Add support to handle DCB_CONFIG_CHANGE event")
Signed-off-by: Linkai Gong <gonglinkai@kylinos.cn>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
isert_send_done() hands ISTATE_SEND_TASKMGTRSP, ISTATE_SEND_REJECT and
ISTATE_SEND_TEXTRSP completions off to isert_comp_wq and returns. The work
item then runs isert_completion_put() -> isert_put_cmd(), which reads
isert_conn->conn and takes conn->cmd_lock.
Nothing orders that work item against teardown. isert_wait_conn() queues
isert_release_work, which frees isert_conn, and iscsit_close_connection()
frees the iscsit_conn right after it returns, so the queued work can run
against freed memory.
Count the deferred control PDU completions per connection and let
isert_wait_conn() wait for them before the release work is queued.
ISTATE_SEND_LOGOUTRSP is deliberately not counted: that branch runs
iscsit_logout_post_handler(), which ends up waiting for
conn->conn_wait_comp, and that completion is only sent by
iscsit_close_connection() after it has called iscsit_wait_conn().
Waiting for it here would deadlock. Its wait stays the existing
isert_wait4logout().
The splat below is from a kernel with tracing printk()s and an msleep(200)
injected into isert_do_control_comp() to widen the window:
BUG: KASAN: slab-use-after-free in isert_put_cmd+0x53d/0x620
Read of size 8 at addr ffff8881054f1038 by task kworker/u17:1/182
CPU: 0 UID: 0 PID: 182 Comm: kworker/u17:1 Tainted: G B 7.2.0-rc5-TWIDE-gb8babf08acc7 #1 PREEMPT(lazy)
Tainted: [B]=BAD_PAGE
Hardware name: QEMU Ubuntu 24.04 PC v2 (i440FX + PIIX, arch_caps fix, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: isert_comp_wq isert_do_control_comp
Call Trace:
<TASK>
dump_stack_lvl+0x53/0x70
print_report+0xd0/0x630
? __pfx__raw_spin_lock_irqsave+0x10/0x10
? _raw_spin_unlock_irqrestore+0x3e/0x70
? isert_put_cmd+0x53d/0x620
kasan_report+0xce/0x100
? isert_put_cmd+0x53d/0x620
isert_put_cmd+0x53d/0x620
? isert_completion_put+0x305/0x330
? isert_do_control_comp+0x2ef/0x310
process_one_work+0x633/0x1030
? assign_work+0x11d/0x370
worker_thread+0x45b/0xd10
? __pfx_worker_thread+0x10/0x10
? __pfx_worker_thread+0x10/0x10
kthread+0x2c6/0x3b0
? recalc_sigpending+0x15c/0x1e0
? __pfx_kthread+0x10/0x10
ret_from_fork+0x36e/0x5a0
? __pfx_ret_from_fork+0x10/0x10
? __switch_to+0x572/0xdd0
? __pfx_kthread+0x10/0x10
ret_from_fork_asm+0x1a/0x30
</TASK>
Allocated by task 48:
kasan_save_stack+0x33/0x60
kasan_save_track+0x14/0x30
__kasan_kmalloc+0x8f/0xa0
__kmalloc_cache_noprof+0x158/0x370
isert_cma_handler+0x1e3/0x2ae0
cma_cm_event_handler+0x3e/0x240
cma_ib_req_handler+0x17d9/0x4490
cm_process_work+0x41/0x330
cm_work_handler+0x5727/0xc160
process_one_work+0x633/0x1030
worker_thread+0x45b/0xd10
kthread+0x2c6/0x3b0
ret_from_fork+0x36e/0x5a0
ret_from_fork_asm+0x1a/0x30
Freed by task 184:
kasan_save_stack+0x33/0x60
kasan_save_track+0x14/0x30
kasan_save_free_info+0x3b/0x60
__kasan_slab_free+0x43/0x70
kfree+0x121/0x380
iscsit_close_connection+0x7cf/0x1e60
iscsit_take_action_for_connection_exit+0x1b6/0x360
iscsi_target_tx_thread+0x472/0x690
kthread+0x2c6/0x3b0
ret_from_fork+0x36e/0x5a0
ret_from_fork_asm+0x1a/0x30
Fixes: b8d26b3be8 ("iser-target: Add iSCSI Extensions for RDMA (iSER) target driver")
Signed-off-by: Yehyeong Lee <yhlee@isslab.korea.ac.kr>
Link: https://patch.msgid.link/20260821080620.1694119-1-yhlee@isslab.korea.ac.kr
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Remove all logical units before disconnecting the transport because one or
more SCSI commands may be submitted while removing logical units. Remove
the SCSI host after the transport has been disconnected because the code
that disconnects the transport needs resources that are freed by the code
that removes the SCSI host (SCSI host tag set). Remove the srp_rport_get()
and srp_rport_put() calls because the purpose of these calls was to keep
the rport until tl_err_work is cancelled.
Reported-by: Yehyeong Lee <yhlee@isslab.korea.ac.kr>
Closes: https://lore.kernel.org/linux-rdma/20260812190418.200337-1-yhlee@isslab.korea.ac.kr/
Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Yehyeong Lee <yhlee@isslab.korea.ac.kr>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
David Howells <dhowells@redhat.com> says:
(1) Fix missing kunmap in afs_dir_search_bucket().
(2) Fix double-unmap of directory block.
(3) Fix an incorrect free in afs_lookup_server().
(4) Clear stale peer app data after address list changes.
* patches from https://patch.msgid.link/20260902121024.3328255-1-dhowells@redhat.com:
afs: Clear stale peer app data after address list changes
afs: Fix incorrect free in candidate cleanup in afs_lookup_server()
afs: Fix double-unmap of directory block
afs: Fix missing kunmap in afs_dir_search_bucket()
Link: https://patch.msgid.link/20260902121024.3328255-1-dhowells@redhat.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
afs_fs_probe_fileserver() fetches the current endpoint state under
server->fs_lock, but leaves old_alist as NULL. Consequently,
afs_set_peer_appdata() treats every address list replacement as initial
setup and only binds the new peers; it never unbinds peers removed from
the old list.
An address refresh can therefore proceed as follows. CPU 0 replaces
server S's list and drops Pold without clearing Pold->app_data. The
server destroyer then clears only S's current peers and lets S reach its
RCU callback. After the callback frees S, CPU 1 handles a callback
through an RxRPC connection that still pins Pold, reads Pold->app_data,
and calls afs_use_server() on the freed object.
KASAN reported:
BUG: KASAN: slab-use-after-free in afs_find_server+0x3c/0xa0
Read of size 4 at addr ffff8881013e1af0 by task krxrpcio/7001/74
Call Trace:
afs_find_server+0x3c/0xa0
afs_rx_new_call+0x15c/0x390
rxrpc_new_incoming_call+0x97c/0x1730
rxrpc_input_packet.constprop.0+0xd03/0xec0
rxrpc_io_thread+0x967/0x1640
Allocated by task 93:
afs_lookup_server+0x1a7/0x14c0
afs_alloc_server_list+0x43f/0xb60
afs_create_volume+0x923/0x1490
afs_get_tree+0x1c6/0x10a0
Freed by task 0:
kfree+0x131/0x3c0
rcu_core+0x50a/0x1850
Last potentially related work creation:
__call_rcu_common.constprop.0+0x71/0xa10
afs_put_server+0x213/0x2b0
Preserve old->addresses for the peer app-data update so that removed
peers are cleared before the endpoint state is replaced. Also advance
both cursors when the old and new lists share a peer; activating the
old/new comparison without this would otherwise loop forever on the
shared entry.
Fixes: 40e8b52fe8 ("afs: Use the per-peer app data provided by rxrpc")
Signed-off-by: Chengfeng Ye <nicoyip.dev@gmail.com>
Signed-off-by: Qi Zhang <marsy12010123@gmail.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Link: https://patch.msgid.link/20260902121024.3328255-5-dhowells@redhat.com
cc: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-fsdevel@vger.kernel.org
cc: stable@vger.kernel.org
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>
Linus Walleij <linusw@kernel.org> says:
Repair independent correctness problems in the DB8500 multichannel
serial port driver. The series fixes duplex and repeated-prepare stream
ownership, error propagation, frame and divider programming, FIFO
watermarks, DAI validation, reset handling, and MMIO resource ownership.
It also removes obsolete PRCMU QoS calls which are unconditional stubs.
The register programming follows the DB8500 v2 reference manual. These
changes are independent of the later sound-card devicetree conversion.
Link: https://patch.msgid.link/20260902-ux500-msp-fixes-v2-0-4b60b002d55a@kernel.org
The DMA engine is configured for four-element bursts, but the MSP
driver never programs the FIFO watermark register and instead depends
on its previous or reset value. The DB8500 DMA request protocol requires
the peripheral watermark to match the DMA packet size.
Program four-element receive and transmit watermarks when configuring
the first direction, before enabling MSP DMA requests.
Fixes: 3592b7f69a ("ASoC: Ux500: Add MSP I2S-driver")
Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260902-ux500-msp-fixes-v2-9-4b60b002d55a@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
ALSA can call the DAI prepare callback again after an XRUN without
first shutting down the stream. The MSP open helper rejects the second
call with -EBUSY because the direction remains configured.
Track successful playback and capture configurations at the DAI layer.
Make repeated prepare calls no-ops and only close directions which were
successfully prepared.
Fixes: 3592b7f69a ("ASoC: Ux500: Add MSP I2S-driver")
Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260902-ux500-msp-fixes-v2-8-4b60b002d55a@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
The DB8500 PRCMU QoS interface consists of unconditional inline stubs,
so the MSP calls and cached constraint state have no effect. Device
power and clocks are already represented by the regulator, power-domain
and common-clock frameworks.
Remove the dead calls and their private state instead of pretending to
change the APE operating point.
Assisted-by: LLM
Signed-off-by: Linus Walleij <linusw@kernel.org>
Link: https://patch.msgid.link/20260902-ux500-msp-fixes-v2-7-4b60b002d55a@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
