Messages in this thread Patch in this message | | | From | huteng19901016@gmail ... | Subject | [PATCH] blk-mq: fix possible NULL pointer access in classic polling | Date | Fri, 16 Dec 2022 23:06:36 +0800 |
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From: "huteng.ht" <huteng.ht@bytedance.com>
Since poll method in blk_mq_ops may not be implemented by driver, add a judgement to avoid NULL pointer access.
Signed-off-by: huteng.ht <huteng.ht@bytedance.com> --- block/blk-mq.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/block/blk-mq.c b/block/blk-mq.c index c5cf0dbca1db..f58f166d1c75 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -4897,6 +4897,8 @@ static int blk_mq_poll_classic(struct request_queue *q, blk_qc_t cookie, int ret; do { + if (!q->mq_ops->poll) + break; ret = q->mq_ops->poll(hctx, iob); if (ret > 0) { __set_current_state(TASK_RUNNING); -- 2.20.1
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