CVE-2024-44963: btrfs: do not BUG_ON() when freeing tree block after error
First published: Wed Sep 04 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: btrfs: do not BUG_ON() when freeing tree block after error When freeing a tree block, at btrfs_free_tree_block(), if we fail to create a delayed reference we don't deal with the error and just do a BUG_ON(). The error most likely to happen is -ENOMEM, and we have a comment mentioning that only -ENOMEM can happen, but that is not true, because in case qgroups are enabled any error returned from btrfs_qgroup_trace_extent_post() (can be -EUCLEAN or anything returned from btrfs_search_slot() for example) can be propagated back to btrfs_free_tree_block(). So stop doing a BUG_ON() and return the error to the callers and make them abort the transaction to prevent leaking space. Syzbot was triggering this, likely due to memory allocation failure injection.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <6.10.5 | |
| debian/linux | <=5.10.223-1<=5.10.226-1<=6.1.115-1<=6.1.119-1 | 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/22d907bcd283d69d5e60497fc0d51969545c583b
- https://git.kernel.org/stable/c/98251cd60b4d702a8a81de442ab621e83a3fb24f
- https://git.kernel.org/stable/c/bb3868033a4cccff7be57e9145f2117cbdc91c11
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44963
- https://nvd.nist.gov/vuln/detail/CVE-2024-44963
- https://launchpad.net/bugs/cve/CVE-2024-44963
- https://security-tracker.debian.org/tracker/CVE-2024-44963
- https://ubuntu.com/security/CVE-2024-44963
- https://git.kernel.org/linus/bb3868033a4cccff7be57e9145f2117cbdc91c11
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