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blk-throttle: fix UAF by deleteing timer in blk_throtl_exit()

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The pending timer has been set up in blk_throtl_init(). However, the
timer is not deleted in blk_throtl_exit(). This means that the timer
handler may still be running after freeing the timer, which would
result in a use-after-free.

Fix by calling del_timer_sync() to delete the timer in blk_throtl_exit().

Signed-off-by: Li Jinlin <lijinlin3@huawei.com>
Link: https://lore.kernel.org/r/20210907121242.2885564-1-lijinlin3@huawei.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Li Jinlin 2021-09-07 20:12:42 +08:00 committed by Jens Axboe
parent dfbb3409b2
commit 884f0e84f1
1 changed files with 1 additions and 0 deletions
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block/blk-throttle.c
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@ -2458,6 +2458,7 @@ int blk_throtl_init(struct request_queue *q)
void blk_throtl_exit(struct request_queue *q)
{
BUG_ON(!q->td);
del_timer_sync(&q->td->service_queue.pending_timer);
throtl_shutdown_wq(q);
blkcg_deactivate_policy(q, &blkcg_policy_throtl);
free_percpu(q->td->latency_buckets[READ]);