diff options
| author | zhengbin <zhengbin13@huawei.com> | 2019-08-12 15:36:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:47:37 +0300 |
| commit | d6e13c8d5cda231e6b0d824804b60395abc1cdcc (patch) | |
| tree | f796602e2767696ec7a998d959696da103bb827d /block | |
| parent | 7d11761a1b0bd71e567a0f4a8a6d7dfbfa9375de (diff) | |
| download | linux-d6e13c8d5cda231e6b0d824804b60395abc1cdcc.tar.xz | |
blk-mq: move cancel of requeue_work to the front of blk_exit_queue
[ Upstream commit e26cc08265dda37d2acc8394604f220ef412299d ]
blk_exit_queue will free elevator_data, while blk_mq_requeue_work
will access it. Move cancel of requeue_work to the front of
blk_exit_queue to avoid use-after-free.
blk_exit_queue blk_mq_requeue_work
__elevator_exit blk_mq_run_hw_queues
blk_mq_exit_sched blk_mq_run_hw_queue
dd_exit_queue blk_mq_hctx_has_pending
kfree(elevator_data) blk_mq_sched_has_work
dd_has_work
Fixes: fbc2a15e3433 ("blk-mq: move cancel of requeue_work into blk_mq_release")
Cc: stable@vger.kernel.org
Reviewed-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: zhengbin <zhengbin13@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'block')
| -rw-r--r-- | block/blk-mq.c | 2 | ||||
| -rw-r--r-- | block/blk-sysfs.c | 3 |
2 files changed, 3 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c index 55139d2fca3e..eac444804736 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -2294,8 +2294,6 @@ void blk_mq_release(struct request_queue *q) struct blk_mq_hw_ctx *hctx; unsigned int i; - cancel_delayed_work_sync(&q->requeue_work); - /* hctx kobj stays in hctx */ queue_for_each_hw_ctx(q, hctx, i) { if (!hctx) diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c index e54be402899d..9caf96c2c108 100644 --- a/block/blk-sysfs.c +++ b/block/blk-sysfs.c @@ -811,6 +811,9 @@ static void __blk_release_queue(struct work_struct *work) blk_free_queue_stats(q->stats); + if (q->mq_ops) + cancel_delayed_work_sync(&q->requeue_work); + blk_exit_rl(q, &q->root_rl); if (q->queue_tags) |