# CVE-2022-50770: CVE-2022-50770

Status: published. Published: 2025-12-24. Updated: 2026-11-10.

In the Linux kernel, the following vulnerability has been resolved:

ocfs2: fix memory leak in ocfs2_mount_volume()

There is a memory leak reported by kmemleak:

  unreferenced object 0xffff88810cc65e60 (size 32):
    comm "mount.ocfs2", pid 23753, jiffies 4302528942 (age 34735.105s)
    hex dump (first 32 bytes):
      10 00 00 00 00 00 00 00 00 01 01 01 01 01 01 01  ................
      01 01 01 01 01 01 01 01 00 00 00 00 00 00 00 00  ................
    backtrace:
      [<ffffffff8170f73d>] __kmalloc+0x4d/0x150
      [<ffffffffa0ac3f51>] ocfs2_compute_replay_slots+0x121/0x330 [ocfs2]
      [<ffffffffa0b65165>] ocfs2_check_volume+0x485/0x900 [ocfs2]
      [<ffffffffa0b68129>] ocfs2_mount_volume.isra.0+0x1e9/0x650 [ocfs2]
      [<ffffffffa0b7160b>] ocfs2_fill_super+0xe0b/0x1740 [ocfs2]
      [<ffffffff818e1fe2>] mount_bdev+0x312/0x400
      [<ffffffff819a086d>] legacy_get_tree+0xed/0x1d0
      [<ffffffff818de82d>] vfs_get_tree+0x7d/0x230
      [<ffffffff81957f92>] path_mount+0xd62/0x1760
      [<ffffffff81958a5a>] do_mount+0xca/0xe0
      [<ffffffff81958d3c>] __x64_sys_mount+0x12c/0x1a0
      [<ffffffff82f26f15>] do_syscall_64+0x35/0x80
      [<ffffffff8300006a>] entry_SYSCALL_64_after_hwframe+0x46/0xb0

This call stack is related to two problems.  Firstly, the ocfs2 super uses
"replay_map" to trace online/offline slots, in order to recover offline
slots during recovery and mount.  But when ocfs2_truncate_log_init()
returns an error in ocfs2_mount_volume(), the memory of "replay_map" will
not be freed in error handling path.  Secondly, the memory of "replay_map"
will not be freed if d_make_root() returns an error in ocfs2_fill_super().
But the memory of "replay_map" will be freed normally when completing
recovery and mount in ocfs2_complete_mount_recovery().

Fix the first problem by adding error handling path to free "replay_map"
when ocfs2_truncate_log_init() fails.  And fix the second problem by
calling ocfs2_free_replay_slots(osb) in the error handling path
"out_dismount".  In addition, since ocfs2_free_replay_slots() is static,
it is necessary to remove its static attribute and declare it in header
file.

## Remediation

No remediation reported in collected sources

## Affected products and versions

Not reported in collected sources.

## Severity and prioritization

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: Not available

- Weaknesses: Not reported

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://git.kernel.org/stable/c/2b7e59ed2e77136e9360274f8f0fc208a003e95c (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/4efe1d2db731bad19891e2fb9b338724b1f598cc (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/50ab0ca3aff4da26037113d69f5a756d8c1a92cd (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/7ef516888c4d30ae41bfcd79e7077d86d92794c5 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/8059e200259e9c483d715fc2df6340c227c3e196 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

- https://git.kernel.org/stable/c/ce2fcf1516d674a174d9b34d1e1024d64de9fba3 (416baaa9-dc9f-4396-8d5f-8c081fb06d67)

## Provenance

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2022-50770; retrieved 2026-11-10; source updated 2026-11-10

Revision: 1f86e7de06d524e02935bb5ac5e8208a6ca04c49134bc85560fcd5060ccf3d88

Canonical: https://y2.dev/cve/CVE-2022-50770

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