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| author | Li Jinlin <lijinlin3@huawei.com> | 2021-09-07 20:12:42 +0800 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-09-07 08:36:56 -0600 |
| commit | 884f0e84f1e3195b801319c8ec3d5774e9bf2710 (patch) | |
| tree | d41b559ce2e109474d97ac2b8aa5250d0d765f53 /block/blk-throttle.c | |
| parent | dfbb3409b27fa42b96f5727a80d3ceb6a8663991 (diff) | |
| download | lwn-884f0e84f1e3195b801319c8ec3d5774e9bf2710.tar.gz lwn-884f0e84f1e3195b801319c8ec3d5774e9bf2710.zip | |
blk-throttle: fix UAF by deleteing timer in blk_throtl_exit()
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>
Diffstat (limited to 'block/blk-throttle.c')
| -rw-r--r-- | block/blk-throttle.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/block/blk-throttle.c b/block/blk-throttle.c index 55c49015e533..7c4e7993ba97 100644 --- a/block/blk-throttle.c +++ b/block/blk-throttle.c @@ -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]); |