High · published May 21, 2024
In the Linux kernel, the following vulnerability has been resolved:
gfs2: Fix use-after-free in gfs2_glock_shrink_scan
The GLF_LRU flag is checked under lru_lock in gfs2_glock_remove_from_lru() to
remove the glock from the lru list in __gfs2_glock_put().
On the shrink scan path, the same flag is cleared under lru_lock but because
of cond_resched_lock(&lru_lock) in gfs2_dispose_glock_lru(), progress on the
put side can be made without deleting the glock from the lru list.
Keep GLF_LRU across the race window opened by cond_resched_lock(&lru_lock) to
ensure correct behavior on both sides - clear GLF_LRU after list_del under
lru_lock.
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 4.4.181, < 4.4.274 | 4.4.274 |
| linux/linux_kernel | ≥ 4.9.180, < 4.9.274 | 4.9.274 |
| linux/linux_kernel | ≥ 4.14.123, < 4.14.238 | 4.14.238 |
| linux/linux_kernel | ≥ 4.19.47, < 4.19.196 | 4.19.196 |
| linux/linux_kernel | ≥ 5.0.20, < 5.1 | 5.1 |
| linux/linux_kernel | ≥ 5.1.6, < 5.4.127 | 5.4.127 |
| linux/linux_kernel | ≥ 5.5, < 5.10.45 | 5.10.45 |
| linux/linux_kernel | ≥ 5.11, < 5.12.12 | 5.12.12 |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |