From 0d11e6aca396e679c07b2dd6af5dc8b7f041fbbd Mon Sep 17 00:00:00 2001 From: Ming Lei Date: Thu, 5 Dec 2013 10:50:39 -0700 Subject: [PATCH] blk-mq: fix use-after-free of request If accounting is on, we will do the IO completion accounting after we have freed the request. Fix that by moving it sooner instead. Signed-off-by: Jens Axboe --- block/blk-mq.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/block/blk-mq.c b/block/blk-mq.c index 70fd6f996600..c79126e11030 100644 --- a/block/blk-mq.c +++ b/block/blk-mq.c @@ -312,12 +312,12 @@ void blk_mq_complete_request(struct request *rq, int error) blk_account_io_completion(rq, bytes); + blk_account_io_done(rq); + if (rq->end_io) rq->end_io(rq, error); else blk_mq_free_request(rq); - - blk_account_io_done(rq); } void __blk_mq_end_io(struct request *rq, int error)