[PATCH 4.14 024/185] blk-mq: move cancel of requeue_work to the front of blk_exit_queue

[Greg Kroah-Hartman]

From: zhengbin <zhengbi...@huawei.com>

[ 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: sta...@vger.kernel.org
Reviewed-by: Ming Lei <ming....@redhat.com>
Signed-off-by: zhengbin <zhengbi...@huawei.com>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 block/blk-mq.c    | 2 --
 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 55139d2fca3e0..eac4448047366 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 e54be402899da..9caf96c2c1081 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)
-- 
2.20.1