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authorzhengbin <zhengbin13@huawei.com>2019-08-12 20:36:55 +0800
committerJens Axboe <axboe@kernel.dk>2019-08-12 08:14:11 -0600
commite26cc08265dda37d2acc8394604f220ef412299d (patch)
tree502e5600f432e2a4def57d560a73788b53a14d54
parent0c9c83043d4957092f74173cfeeb5bc63e7a70e7 (diff)
blk-mq: move cancel of requeue_work to the front of blk_exit_queue
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>
-rw-r--r--block/blk-mq.c2
-rw-r--r--block/blk-sysfs.c3
2 files changed, 3 insertions, 2 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index f78d3287dd82..a8e6a58f5f28 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -2666,8 +2666,6 @@ void blk_mq_release(struct request_queue *q)
struct blk_mq_hw_ctx *hctx, *next;
int i;
- cancel_delayed_work_sync(&q->requeue_work);
-
queue_for_each_hw_ctx(q, hctx, i)
WARN_ON_ONCE(hctx && list_empty(&hctx->hctx_list));
diff --git a/block/blk-sysfs.c b/block/blk-sysfs.c
index 977c659dcd18..9bfa3ea4ed63 100644
--- a/block/blk-sysfs.c
+++ b/block/blk-sysfs.c
@@ -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);