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Paulo Alcantara 01bce099af smb: client: fix NULL ptr deref in cifs_mark_open_handles_for_deleted_file() 
[ Upstream commit ec4535b2a1 ]

cifs_get_fattr() may be called with a NULL inode, so check for a
non-NULL inode before calling
cifs_mark_open_handles_for_deleted_file().

This fixes the following oops:

  mount.cifs //srv/share /mnt -o ...,vers=3.1.1
  cd /mnt
  touch foo; tail -f foo &
  rm foo
  cat foo

  BUG: kernel NULL pointer dereference, address: 00000000000005c0
  #PF: supervisor read access in kernel mode
  #PF: error_code(0x0000) - not-present page
  PGD 0 P4D 0
  Oops: 0000 [#1] PREEMPT SMP NOPTI
  CPU: 2 PID: 696 Comm: cat Not tainted 6.9.0-rc2 #1
  Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS
  1.16.3-1.fc39 04/01/2014
  RIP: 0010:__lock_acquire+0x5d/0x1c70
  Code: 00 00 44 8b a4 24 a0 00 00 00 45 85 f6 0f 84 bb 06 00 00 8b 2d
  48 e2 95 01 45 89 c3 41 89 d2 45 89 c8 85 ed 0 0 <48> 81 3f 40 7a 76
  83 44 0f 44 d8 83 fe 01 0f 86 1b 03 00 00 31 d2
  RSP: 0018:ffffc90000b37490 EFLAGS: 00010002
  RAX: 0000000000000000 RBX: ffff888110021ec0 RCX: 0000000000000000
  RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000000005c0
  RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
  R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
  R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000200
  FS: 00007f2a1fa08740(0000) GS:ffff888157a00000(0000)
  knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0:
  0000000080050033
  CR2: 00000000000005c0 CR3: 000000011ac7c000 CR4: 0000000000750ef0
  PKRU: 55555554
  Call Trace:
   <TASK>
   ? __die+0x23/0x70
   ? page_fault_oops+0x180/0x490
   ? srso_alias_return_thunk+0x5/0xfbef5
   ? exc_page_fault+0x70/0x230
   ? asm_exc_page_fault+0x26/0x30
   ? __lock_acquire+0x5d/0x1c70
   ? srso_alias_return_thunk+0x5/0xfbef5
   ? srso_alias_return_thunk+0x5/0xfbef5
   lock_acquire+0xc0/0x2d0
   ? cifs_mark_open_handles_for_deleted_file+0x3a/0x100 [cifs]
   ? srso_alias_return_thunk+0x5/0xfbef5
   ? kmem_cache_alloc+0x2d9/0x370
   _raw_spin_lock+0x34/0x80
   ? cifs_mark_open_handles_for_deleted_file+0x3a/0x100 [cifs]
   cifs_mark_open_handles_for_deleted_file+0x3a/0x100 [cifs]
   cifs_get_fattr+0x24c/0x940 [cifs]
   ? srso_alias_return_thunk+0x5/0xfbef5
   cifs_get_inode_info+0x96/0x120 [cifs]
   cifs_lookup+0x16e/0x800 [cifs]
   cifs_atomic_open+0xc7/0x5d0 [cifs]
   ? lookup_open.isra.0+0x3ce/0x5f0
   ? __pfx_cifs_atomic_open+0x10/0x10 [cifs]
   lookup_open.isra.0+0x3ce/0x5f0
   path_openat+0x42b/0xc30
   ? srso_alias_return_thunk+0x5/0xfbef5
   ? srso_alias_return_thunk+0x5/0xfbef5
   ? srso_alias_return_thunk+0x5/0xfbef5
   do_filp_open+0xc4/0x170
   do_sys_openat2+0xab/0xe0
   __x64_sys_openat+0x57/0xa0
   do_syscall_64+0xc1/0x1e0
   entry_SYSCALL_64_after_hwframe+0x72/0x7a

Fixes: ffceb7640c ("smb: client: do not defer close open handles to deleted files")
Reviewed-by: Meetakshi Setiya <msetiya@microsoft.com>
Reviewed-by: Bharath SM <bharathsm@microsoft.com>
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2024-05-25 16:22:51 +02:00
arch x86/apic: Don't access the APIC when disabling x2APIC 2024-05-17 12:02:35 +02:00
block blk-iocost: do not WARN if iocg was already offlined 2024-05-17 12:02:20 +02:00
certs certs: Reference revocation list for all keyrings 2023-08-17 20:12:41 +00:00
crypto crypto: jitter - fix CRYPTO_JITTERENTROPY help text 2024-03-26 18:19:52 -04:00
Documentation dt-bindings: iio: health: maxim,max30102: fix compatible check 2024-05-17 12:02:31 +02:00
drivers md: fix kmemleak of rdev->serial 2024-05-17 12:02:39 +02:00
fs smb: client: fix NULL ptr deref in cifs_mark_open_handles_for_deleted_file() 2024-05-25 16:22:51 +02:00
include VFIO: Add the SPR_DSA and SPR_IAX devices to the denylist 2024-05-17 12:02:38 +02:00
init rust: make mutually exclusive with CFI_CLANG 2024-05-02 16:32:42 +02:00
io_uring io_uring: Fix io_cqring_wait() not restoring sigmask on get_timespec64() failure 2024-04-27 17:11:30 +02:00
ipc Add x86 shadow stack support 2023-08-31 12:20:12 -07:00
kernel workqueue: Fix selection of wake_cpu in kick_pool() 2024-05-17 12:02:31 +02:00
lib dyndbg: fix old BUG_ON in >control parser 2024-05-17 12:02:33 +02:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm/hugetlb: fix DEBUG_LOCKS_WARN_ON(1) when dissolve_free_hugetlb_folio() 2024-05-17 12:02:39 +02:00
net net: fix out-of-bounds access in ops_init 2024-05-17 12:02:35 +02:00
rust rust: kernel: require Send for Module implementations 2024-05-17 12:01:56 +02:00
samples work around gcc bugs with 'asm goto' with outputs 2024-02-23 09:24:47 +01:00
scripts kbuild: Disable KCSAN for autogenerated *.mod.c intermediaries 2024-05-17 12:02:12 +02:00
security keys: Fix overwrite of key expiration on instantiation 2024-05-17 12:02:39 +02:00
sound ASoC: ti: davinci-mcasp: Fix race condition during probe 2024-05-17 12:02:32 +02:00
tools Revert "selftests/bpf: Add netkit to tc_redirect selftest" 2024-05-17 12:02:39 +02:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Always flush async #PF workqueue when vCPU is being destroyed 2024-04-03 15:28:18 +02:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore kbuild: rpm-pkg: rename binkernel.spec to kernel.spec 2023-07-25 00:59:33 +09:00
.mailmap 20 hotfixes. 12 are cc:stable and the remainder address post-6.5 issues 2023-10-24 09:52:16 -10:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS USB: Remove Wireless USB and UWB documentation 2023-08-09 14:17:32 +02:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS ALSA: scarlett2: Rename scarlett_gen2 to scarlett2 2024-04-27 17:11:36 +02:00
Makefile Linux 6.6.31 2024-05-17 12:02:40 +02:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.