Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find() Syzbot reports a warning as follows: ============================================ WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Modules linked in: CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Call Trace: <TASK> ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] ============================================ This is because when finding an entry in ext4_xattr_block_cache_find(), if ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown in the __entry_find(), won't be put away, and eventually trigger the above issue in mb_cache_destroy() due to reference count leakage. So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b878c8a7f08f0c225b6a46ba1ac867e9c5d17807 before 9ad75e78747b5a50dc5a52f0f8e92e920a653f16; affected fb265c9cb49e2074ddcdd4de99728aefdd3b3592 before 896a7e7d0d555ad8b2b46af0c2fa7de7467f9483; affected fb265c9cb49e2074ddcdd4de99728aefdd3b3592 before 76dc776153a47372719d664e0fc50d6355791abb; affected fb265c9cb49e2074ddcdd4de99728aefdd3b3592 before 681ff9a09accd8a4379f8bd30b7a1641ee19bb3e; affected fb265c9cb49e2074ddcdd4de99728aefdd3b3592 before e941b712e758f615d311946bf98216e79145ccd9; affected fb265c9cb49e2074ddcdd4de99728aefdd3b3592 before a95df6f04f2c37291adf26a74205cde0314d4577; affected fb265c9cb49e2074ddcdd4de99728aefdd3b3592 before b37c0edef4e66fb21a2fbc211471195a383e5ab8; affected fb265c9cb49e2074ddcdd4de99728aefdd3b3592 before 0c0b4a49d3e7f49690a6827a41faeffad5df7e21; affected 9da1f6d06b7a6d068e68fcfd7cbbf6b586d888e1; affected 81313ed2c705d958744882a269bf4a5e3ddec95e; affected 4.19.14 before 4.19.316; affected 4.14.92 before 4.15; affected 4.20.1 before 4.21 |
| Linux / Linux | affected 5.0; unaffected 0 before 5.0; unaffected 4.19.316 through 4.19.*; unaffected 5.4.278 through 5.4.*; unaffected 5.10.219 through 5.10.*; unaffected 5.15.161 through 5.15.*; unaffected 6.1.94 through 6.1.*; unaffected 6.6.34 through 6.6.*; unaffected 6.9.5 through 6.9.*; unaffected 6.10 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16
- https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483
- https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb
- https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e
- https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9
- https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577
- https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8
- https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21
ADP enrichment
No English description supplied.
No references supplied.
No English description supplied.
- https://git.kernel.org/stable/c/9ad75e78747b5a50dc5a52f0f8e92e920a653f16
- https://git.kernel.org/stable/c/896a7e7d0d555ad8b2b46af0c2fa7de7467f9483
- https://git.kernel.org/stable/c/76dc776153a47372719d664e0fc50d6355791abb
- https://git.kernel.org/stable/c/681ff9a09accd8a4379f8bd30b7a1641ee19bb3e
- https://git.kernel.org/stable/c/e941b712e758f615d311946bf98216e79145ccd9
- https://git.kernel.org/stable/c/a95df6f04f2c37291adf26a74205cde0314d4577
- https://git.kernel.org/stable/c/b37c0edef4e66fb21a2fbc211471195a383e5ab8
- https://git.kernel.org/stable/c/0c0b4a49d3e7f49690a6827a41faeffad5df7e21