[PATCH 6.1 0908/1146] block: fix use-after-free of q->q_usage_counter

Greg Kroah-Hartman
2022-12-28T16:47:32Z

From: Ming Lei <ming.lei@redhat.com>

[ Upstream commit d36a9ea5e7766961e753ee38d4c331bbe6ef659b ]

For blk-mq, queue release handler is usually called after
blk_mq_freeze_queue_wait() returns. However, the
q_usage_counter->release() handler may not be run yet at that time, so
this can cause a use-after-free.

Fix the issue by moving percpu_ref_exit() into blk_free_queue_rcu().
Since ->release() is called with rcu read lock held, it is agreed that
the race should be covered in caller per discussion from the two links.

Reported-by: Zhang Wensheng <zhangwensheng@huaweicloud.com>
Reported-by: Zhong Jinghua <zhongjinghua@huawei.com>
Link: https://lore.kernel.org/linux-block/Y5prfOjyyjQKUrtH@T590/T/#u
Link: https://lore.kernel.org/lkml/Y4%2FmzMd4evRg9yDi@fedora/
Cc: Hillf Danton <hdanton@sina.com>
Cc: Yu Kuai <yukuai3@huawei.com>
Cc: Dennis Zhou <dennis@kernel.org>
Fixes: 2b0d3d3e4fcf ("percpu_ref: reduce memory footprint of percpu_ref in fast path")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20221215021629.74870-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
block/blk-core.c | 9 +++++----
1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/block/blk-core.c b/block/blk-core.c
index 815ffce6b988..52e77471a7ae 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -254,14 +254,15 @@ EXPORT_SYMBOL_GPL(blk_clear_pm_only);

static void blk_free_queue_rcu(struct rcu_head *rcu_head)
{
- kmem_cache_free(blk_requestq_cachep,
- container_of(rcu_head, struct request_queue, rcu_head));
+ struct request_queue *q = container_of(rcu_head,
+ struct request_queue, rcu_head);
+
+ percpu_ref_exit(&q->q_usage_counter);
+ kmem_cache_free(blk_requestq_cachep, q);
}

static void blk_free_queue(struct request_queue *q)
{
- percpu_ref_exit(&q->q_usage_counter);
-
if (q->poll_stat)
blk_stat_remove_callback(q, q->poll_cb);
blk_stat_free_callback(q->poll_cb);
--
2.35.1