Re: [PATCH] fs/mbcache: cancel shrink work before destroying the cache

[Christian Brauner <brauner@kernel.org>]

On Tue, 17 Mar 2026 14:45:56 +0900, Hyungjung Joo wrote:
> mb_cache_destroy() calls shrinker_free() and then frees all cache
> entries and the cache itself, but it does not cancel the pending
> c_shrink_work work item first.
> 
> If mb_cache_entry_create() schedules c_shrink_work via schedule_work()
> and the work item is still pending or running when mb_cache_destroy()
> runs, mb_cache_shrink_worker() will access the cache after its memory
> has been freed, causing a use-after-free.
> 
> [...]


Pretty sure this is AI generated and it misses a Fixes: tag but otherwise looks
correct.

---

Applied to the vfs-7.1.misc branch of the vfs/vfs.git tree.
Patches in the vfs-7.1.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs-7.1.misc

[1/1] fs/mbcache: cancel shrink work before destroying the cache
      https://git.kernel.org/vfs/vfs/c/d227786ab111