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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Ming Lei <ming.lei@redhat.com>,
        zhengbin <zhengbin13@huawei.com>, Jens Axboe <axboe@kernel.dk>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 49/63] blk-mq: move cancel of requeue_work to the front of blk_exit_queue
Date:   Sun, 29 Sep 2019 15:54:22 +0200
Message-Id: <20190929135039.979179041@linuxfoundation.org>
In-Reply-To: <20190929135031.382429403@linuxfoundation.org>
References: <20190929135031.382429403@linuxfoundation.org>
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From: zhengbin <zhengbin13@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: 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>
---
 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 9dfafee65bce2..7ea85ec52026e 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2461,8 +2461,6 @@ 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 3772671cf2bc5..bab47a17b96f4 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -836,6 +836,9 @@ 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