CVE-2024-46840: btrfs: clean up our handling of refs == 0 in snapshot delete
First published: Fri Sep 27 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: btrfs: clean up our handling of refs == 0 in snapshot delete In reada we BUG_ON(refs == 0), which could be unkind since we aren't holding a lock on the extent leaf and thus could get a transient incorrect answer. In walk_down_proc we also BUG_ON(refs == 0), which could happen if we have extent tree corruption. Change that to return -EUCLEAN. In do_walk_down() we catch this case and handle it correctly, however we return -EIO, which -EUCLEAN is a more appropriate error code. Finally in walk_up_proc we have the same BUG_ON(refs == 0), so convert that to proper error handling. Also adjust the error message so we can actually do something with the information.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | <4.19.322 | |
| Linux Linux kernel | >=4.20<5.4.284 | |
| Linux Linux kernel | >=5.5<5.10.226 | |
| Linux Linux kernel | >=5.11<5.15.167 | |
| Linux Linux kernel | >=5.16<6.1.110 | |
| Linux Linux kernel | >=6.2<6.6.51 | |
| Linux Linux kernel | >=6.7<6.10.10 | |
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.112-1 6.11.7-1 6.11.9-1 |
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Reference Links
- https://git.kernel.org/stable/c/c847b28a799733b04574060ab9d00f215970627d
- https://git.kernel.org/stable/c/71291aa7246645ef622621934d2067400380645e
- https://git.kernel.org/stable/c/c60676b81fab456b672796830f6d8057058f029c
- https://git.kernel.org/stable/c/728d4d045b628e006b48a448f3326a7194c88d32
- https://git.kernel.org/stable/c/9cc887ac24b7a0598f4042ae9af6b9a33072f75b
- https://git.kernel.org/stable/c/7d1df13bf078ffebfedd361d714ff6cee1ff01b9
- https://git.kernel.org/stable/c/03804641ec2d0da4fa088ad21c88e703d151ce16
- https://git.kernel.org/stable/c/b8ccef048354074a548f108e51d0557d6adfd3a3
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-46840
- https://nvd.nist.gov/vuln/detail/CVE-2024-46840
- https://launchpad.net/bugs/cve/CVE-2024-46840
- https://security-tracker.debian.org/tracker/CVE-2024-46840
- https://ubuntu.com/security/CVE-2024-46840
- https://git.kernel.org/linus/b8ccef048354074a548f108e51d0557d6adfd3a3
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