blk-mq: fix NULL dereference on q->elevator in blk_mq_elv_switch_none

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[ Upstream commit 245165658e ]

After grabbing q->sysfs_lock, q->elevator may become NULL because of
elevator switch.

Fix the NULL dereference on q->elevator by checking it with lock.

Reported-by: Guangwu Zhang <guazhang@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20230616132354.415109-1-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Ming Lei 2023-06-16 21:23:54 +08:00 • committed by Greg Kroah-Hartman

parent 4cc664e59b

commit 3e97738652

1 changed files with 7 additions and 3 deletions

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block/blk-mq.c

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