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linux/fs/ocfs2
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Prithvi Tambewagh d0fd1f732e ocfs2: fix kernel BUG in ocfs2_find_victim_chain 
commit 039bef30e3 upstream.

syzbot reported a kernel BUG in ocfs2_find_victim_chain() because the
`cl_next_free_rec` field of the allocation chain list (next free slot in
the chain list) is 0, triggring the BUG_ON(!cl->cl_next_free_rec)
condition in ocfs2_find_victim_chain() and panicking the kernel.

To fix this, an if condition is introduced in ocfs2_claim_suballoc_bits(),
just before calling ocfs2_find_victim_chain(), the code block in it being
executed when either of the following conditions is true:

1. `cl_next_free_rec` is equal to 0, indicating that there are no free
chains in the allocation chain list
2. `cl_next_free_rec` is greater than `cl_count` (the total number of
chains in the allocation chain list)

Either of them being true is indicative of the fact that there are no
chains left for usage.

This is addressed using ocfs2_error(), which prints
the error log for debugging purposes, rather than panicking the kernel.

Link: https://lkml.kernel.org/r/20251201130711.143900-1-activprithvi@gmail.com
Signed-off-by: Prithvi Tambewagh <activprithvi@gmail.com>
Reported-by: syzbot+96d38c6e1655c1420a72@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=96d38c6e1655c1420a72
Tested-by: syzbot+96d38c6e1655c1420a72@syzkaller.appspotmail.com
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Jun Piao <piaojun@huawei.com>
Cc: Heming Zhao <heming.zhao@suse.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-01-19 13:09:52 +01:00
..
cluster ocfs2: remove redundant initialization of variable ret 2021-06-29 10:53:46 -07:00
dlm ocfs2: remove redundant assignment to pointer queue 2021-06-29 10:53:46 -07:00
dlmfs ocfs2: dlmfs: fix error handling of user_dlm_destroy_lock 2022-06-09 10:23:22 +02:00
acl.c vfs: add rcu argument to ->get_acl() callback 2021-08-18 22:08:24 +02:00
acl.h vfs: add rcu argument to ->get_acl() callback 2021-08-18 22:08:24 +02:00
alloc.c ocfs2: fix memory leak in ocfs2_merge_rec_left() 2026-01-19 13:09:40 +01:00
alloc.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
aops.c ocfs2: fix uninit-value in ocfs2_get_block() 2024-10-17 15:10:31 +02:00
aops.h ocfs2: fix uninitialized value in ocfs2_file_read_iter() 2024-12-14 19:51:03 +01:00
blockcheck.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
blockcheck.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
buffer_head_io.c ocfs2: fix possible null-ptr-deref in ocfs2_set_buffer_uptodate 2024-10-17 15:10:32 +02:00
buffer_head_io.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
dcache.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
dcache.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
dir.c ocfs2: check dir i_size in ocfs2_find_entry 2025-03-13 12:50:34 +01:00
dir.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
dlmglue.c ocfs2: update seq_file index in ocfs2_dlm_seq_next 2024-12-14 19:51:34 +01:00
dlmglue.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
export.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
export.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
extent_map.c ocfs2: fix recursive semaphore deadlock in fiemap call 2025-10-02 13:39:01 +02:00
extent_map.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
file.c ocfs2: fix uninitialized value in ocfs2_file_read_iter() 2024-12-14 19:51:03 +01:00
file.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
filecheck.c ocfs2: fix snprintf() checking 2021-06-29 10:53:46 -07:00
filecheck.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
heartbeat.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
heartbeat.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
inode.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
inode.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
ioctl.c ocfs2: convert to fileattr 2021-04-12 15:04:30 +02:00
ioctl.h ocfs2: convert to fileattr 2021-04-12 15:04:30 +02:00
journal.c ocfs2: stop quota recovery before disabling quotas 2025-05-18 08:20:37 +02:00
journal.h ocfs2: stop quota recovery before disabling quotas 2025-05-18 08:20:37 +02:00
Kconfig ocfs2: replace HTTP links with HTTPS ones 2020-08-07 11:33:22 -07:00
localalloc.c ocfs2: Revert "ocfs2: fix the la space leak when unmounting an ocfs2 volume" 2024-12-14 19:51:45 +01:00
localalloc.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
locks.c fs: remove mandatory file locking support 2021-08-23 06:15:36 -04:00
locks.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
Makefile ocfs2: improve ocfs2 Makefile 2018-12-28 12:11:45 -08:00
mmap.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
mmap.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
move_extents.c ocfs2: relax BUG() to ocfs2_error() in __ocfs2_move_extent() 2026-01-19 13:09:29 +01:00
move_extents.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
namei.c ocfs2: free inode when ocfs2_get_init_inode() fails 2024-12-14 19:51:31 +01:00
namei.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
ocfs1_fs_compat.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
ocfs2.h ocfs2: stop quota recovery before disabling quotas 2025-05-18 08:20:37 +02:00
ocfs2_fs.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
ocfs2_ioctl.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
ocfs2_lockid.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
ocfs2_lockingver.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
ocfs2_trace.h ocfs2: fix DIO failure due to insufficient transaction credits 2024-07-05 09:14:45 +02:00
quota.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
quota_global.c ocfs2: mark dquot as inactive if failed to start trans while releasing dquot 2025-03-13 12:50:10 +01:00
quota_local.c ocfs2: fix possible memory leak in ocfs2_finish_quota_recovery 2025-06-27 11:05:14 +01:00
refcounttree.c ocfs2: reserve space for inline xattr before attaching reflink tree 2024-10-17 15:10:31 +02:00
refcounttree.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
reservations.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
reservations.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
resize.c ocfs2: uncache inode which has failed entering the group 2024-12-14 19:50:35 +01:00
resize.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
slot_map.c Revert "ocfs2: mount shared volume without ha stack" 2022-08-03 12:03:41 +02:00
slot_map.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
stack_o2cb.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
stack_user.c ocfs2: fix double free in user_cluster_connect() 2025-10-19 16:21:37 +02:00
stackglue.c ocfs2: fix memory leak in ocfs2_stack_glue_init() 2022-12-31 13:14:02 +01:00
stackglue.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
suballoc.c ocfs2: fix kernel BUG in ocfs2_find_victim_chain 2026-01-19 13:09:52 +01:00
suballoc.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
super.c ocfs2: stop quota recovery before disabling quotas 2025-05-18 08:20:37 +02:00
super.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
symlink.c ocfs2: handle a symlink read error correctly 2025-03-13 12:50:32 +01:00
symlink.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
sysfile.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
sysfile.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
uptodate.c treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
uptodate.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00
xattr.c ocfs2: remove entry once instead of null-ptr-dereference in ocfs2_xa_remove() 2024-11-14 13:13:42 +01:00
xattr.h treewide: remove editor modelines and cruft 2021-05-07 00:26:34 -07:00