Riskcovery

CVE-2024-40951

ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger()

State
Published
Severity
Not scored
Published
Jul 12, 2024
Updated
May 11, 2026
Reserved
Jul 12, 2024

Read the record on cve.org

Description

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

ocfs2: fix NULL pointer dereference in ocfs2_abort_trigger()

bdev->bd_super has been removed and commit 8887b94d9322 change the usage from bdev->bd_super to b_assoc_map->host->i_sb. Since ocfs2 hasn't set bh->b_assoc_map, it will trigger NULL pointer dereference when calling into ocfs2_abort_trigger().

Actually this was pointed out in history, see commit 74e364ad1b13. But I've made a mistake when reviewing commit 8887b94d9322 and then re-introduce this regression.

Since we cannot revive bdev in buffer head, so fix this issue by initializing all types of ocfs2 triggers when fill super, and then get the specific ocfs2 trigger from ocfs2_caching_info when access journal.

[joseph.qi@linux.alibaba.com: v2]

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 8887b94d93224e0ef7e1bc6369640e313b8b12f4 to before 67bcecd780609f471260a8c83fb0ae15f27734ceAffected
  • 8887b94d93224e0ef7e1bc6369640e313b8b12f4 to before eb63357ef229fae061ce7ce2839d558681c42f1aAffected
  • 8887b94d93224e0ef7e1bc6369640e313b8b12f4 to before 685d03c3795378fca6a1b3d43581f7f1a3fc095fAffected
LinuxLinux
  • 6.6Affected
  • before 6.6Not affected
  • 6.6.36 through 6.6.*Not affected
  • 6.9.7 through 6.9.*Not affected
  • 6.10 and laterNot affected

References

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