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* [PATCH AUTOSEL 4.14 2/2] blk-throttle: fix UAF by deleteing timer in blk_throtl_exit()
       [not found] <>
@ 2021-09-17  2:35 ` Sasha Levin
  0 siblings, 0 replies; only message in thread
From: Sasha Levin @ 2021-09-17  2:35 UTC (permalink / raw)
  To: linux-kernel, stable
  Cc: Li Jinlin, Jens Axboe, Sasha Levin, tj, cgroups, linux-block

From: Li Jinlin <>

[ Upstream commit 884f0e84f1e3195b801319c8ec3d5774e9bf2710 ]

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 <>
Signed-off-by: Jens Axboe <>
Signed-off-by: Sasha Levin <>
 block/blk-throttle.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/block/blk-throttle.c b/block/blk-throttle.c
index a8cd7b3d9647..fcbbe2e45a2b 100644
--- a/block/blk-throttle.c
+++ b/block/blk-throttle.c
@@ -2414,6 +2414,7 @@ int blk_throtl_init(struct request_queue *q)
 void blk_throtl_exit(struct request_queue *q)
+	del_timer_sync(&q->td->service_queue.pending_timer);
 	blkcg_deactivate_policy(q, &blkcg_policy_throtl);

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2021-09-17  2:35 ` [PATCH AUTOSEL 4.14 2/2] blk-throttle: fix UAF by deleteing timer in blk_throtl_exit() Sasha Levin

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