blk-cgroup: protect q->blkg_list iteration in blkg_destroy_all() with blkcg_mutex

Browse source

blkg_destroy_all() iterates q->blkg_list without holding blkcg_mutex,
which can race with blkg_free_workfn() that removes blkgs from the list
while holding blkcg_mutex.

Add blkcg_mutex protection around the q->blkg_list iteration to prevent
potential list corruption or use-after-free issues.

Reviewed-by: Tang Yizhou <yizhou.tang@shopee.com>
Signed-off-by: Yu Kuai <yukuai@fygo.io>
Reviewed-by: Tao Cui <cuitao@kylinos.cn>
Reviewed-by: Nilay Shroff <nilay@linux.ibm.com>
Link: https://patch.msgid.link/20260802112525.3933753-2-yukuai@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

...

This commit is contained in:

Yu Kuai 2026-08-02 19:25:17 +08:00 • committed by Jens Axboe

parent 3be7ad35f1

commit 9a91679894

1 changed files with 3 additions and 0 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

3

block/blk-cgroup.c

View file