CVE-2022-50755High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: udf: Avoid double brelse() in udf_rename() syzbot reported a warning like below [1]: VFS: brelse: Trying to free free buffer WARNING: CPU: 2 PID: 7301 at fs/buffer.c:…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
udf: Avoid double brelse() in udf_rename()
syzbot reported a warning like below [1]:
VFS: brelse: Trying to free free buffer WARNING: CPU: 2 PID: 7301 at fs/buffer.c:1145 __brelse+0x67/0xa0 ... Call Trace: <TASK> invalidate_bh_lru+0x99/0x150 smp_call_function_many_cond+0xe2a/0x10c0 ? generic_remap_file_range_prep+0x50/0x50 ? __brelse+0xa0/0xa0 ? __mutex_lock+0x21c/0x12d0 ? smp_call_on_cpu+0x250/0x250 ? rcu_read_lock_sched_held+0xb/0x60 ? lock_release+0x587/0x810 ? __brelse+0xa0/0xa0 ? generic_remap_file_range_prep+0x50/0x50 on_each_cpu_cond_mask+0x3c/0x80 blkdev_flush_mapping+0x13a/0x2f0 blkdev_put_whole+0xd3/0xf0 blkdev_put+0x222/0x760 deactivate_locked_super+0x96/0x160 deactivate_super+0xda/0x100 cleanup_mnt+0x222/0x3d0 task_work_run+0x149/0x240 ? task_work_cancel+0x30/0x30 do_exit+0xb29/0x2a40 ? reacquire_held_locks+0x4a0/0x4a0 ? do_raw_spin_lock+0x12a/0x2b0 ? mm_update_next_owner+0x7c0/0x7c0 ? rwlock_bug.part.0+0x90/0x90 ? zap_other_threads+0x234/0x2d0 do_group_exit+0xd0/0x2a0 __x64_sys_exit_group+0x3a/0x50 do_syscall_64+0x34/0xb0 entry_SYSCALL_64_after_hwframe+0x63/0xcd
The cause of the issue is that brelse() is called on both ofibh.sbh and ofibh.ebh by udf_find_entry() when it returns NULL. However, brelse() is called by udf_rename(), too. So, b_count on buffer_head becomes unbalanced.
This patch fixes the issue by not calling brelse() by udf_rename() when udf_find_entry() returns NULL.
Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 78eba2778ae10fb2a9d450e14d26eb6f6bf1f906Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 9d2cad69547abea961fa80426d600b861de1952bLinux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < d6da7ec0f94f5208c848e0e94b70f54a0bd9c587Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 156d440dea97deada629bb51cb17887abd862605Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 40dba68d418237b1ae2beaa06d46a94dd946278eLinux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < e7a6a53c871460727be09f4414ccb29fb8697526Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 4fca09045509f5bde8fc28e68fbca38cb4bdcf2eLinux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < 090bf49833c51da297ec74f98ad2bf44daea9311Linux >= 231473f6ddcef9c01993e0bfe36acc6f8e425c31 < c791730f2554a9ebb8f18df9368dc27d4ebc38c2Linux 4.2Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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