Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: jfs: nlink overflow in jfs_rename If nlink is maximal for a directory (-1) and inside that directory you perform a rename for some child directory (not moving from the parent), then the nlink of the first directory is first incremented and later decremented. Normally this is fine, but when nlink = -1 this causes a wrap around to 0, and then drop_nlink issues a warning. After applying the patch syzbot no longer issues any warnings. I also ran some basic fs tests to look for any regressions.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 2108829a59f081e822fdab8c2cd7131deb8aa8a1; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before a3d66089e50a6e0142f8884471f74292102ea9aa; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f70fcbc2ac7c24f087a2c895c5753aa730b1e479; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 5d77c36cd4b698649f5c30c5f6c084f4f61d1880; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fe136426e30ca6debcf916fd6a141555ed9fde74; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 93c325746ae59709b4f9bad4e3e4761c8d566c70; affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9218dc26fd922b09858ecd3666ed57dfd8098da8 |
| Linux / Linux | affected 2.6.12; unaffected 0 before 2.6.12; unaffected 5.10.252 through 5.10.*; unaffected 5.15.202 through 5.15.*; unaffected 6.1.165 through 6.1.*; unaffected 6.6.128 through 6.6.*; unaffected 6.12.75 through 6.12.*; unaffected 6.18.16 through 6.18.*; unaffected 6.19.6 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/2108829a59f081e822fdab8c2cd7131deb8aa8a1
- https://git.kernel.org/stable/c/b4330a0d0947fbdc9d445cbbeabd8cc910a8c9ca
- https://git.kernel.org/stable/c/a3d66089e50a6e0142f8884471f74292102ea9aa
- https://git.kernel.org/stable/c/f70fcbc2ac7c24f087a2c895c5753aa730b1e479
- https://git.kernel.org/stable/c/5d77c36cd4b698649f5c30c5f6c084f4f61d1880
- https://git.kernel.org/stable/c/fe136426e30ca6debcf916fd6a141555ed9fde74
- https://git.kernel.org/stable/c/93c325746ae59709b4f9bad4e3e4761c8d566c70
- https://git.kernel.org/stable/c/9218dc26fd922b09858ecd3666ed57dfd8098da8