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blk-mq: move cancel of requeue_work to the front of blk_exit_queue

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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: fbc2a15e34 ("blk-mq: move cancel of requeue_work into blk_mq_release")
Cc: [email protected]
Reviewed-by: Ming Lei <[email protected]>
Signed-off-by: zhengbin <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
zhengbin 2019-08-12 20:36:55 +08:00 • committed by Jens Axboe
commit e26cc08265
2 changed files with 3 additions and 2 deletions
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3
block/blk-sysfs.c
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@ -892,6 +892,9 @@ static void __blk_release_queue(struct work_struct *work)
blk_free_queue_stats(q->stats);
if (queue_is_mq(q))
cancel_delayed_work_sync(&q->requeue_work);
blk_exit_queue(q);
blk_queue_free_zone_bitmaps(q);