From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ming Lei Subject: [PATCH V2 0/2] block/scsi/dm-rq: fix leak of request private data in dm-mpath Date: Sat, 20 Jul 2019 11:06:35 +0800 Message-ID: <20190720030637.14447-1-ming.lei@redhat.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Sender: stable-owner@vger.kernel.org To: Jens Axboe Cc: linux-block@vger.kernel.org, "James E . J . Bottomley" , "Martin K . Petersen" , linux-scsi@vger.kernel.org, Ming Lei , "Ewan D . Milne" , Bart Van Assche , Hannes Reinecke , Christoph Hellwig , Mike Snitzer , dm-devel@redhat.com, stable@vger.kernel.org List-Id: linux-scsi@vger.kernel.org Hi, When one request is dispatched to LLD via dm-rq, if the result is BLK_STS_*RESOURCE, dm-rq will free the request. However, LLD may allocate private data for this request, so this way will cause memory leak. Add .cleanup_rq() callback and implement it in SCSI for fixing the issue, since SCSI is the only driver which allocates private requst data in .queue_rq() path. Another use case of this callback is to free the request and re-submit bios during cpu hotplug when the hctx is dead, see the following link: https://lore.kernel.org/linux-block/f122e8f2-5ede-2d83-9ca0-bc713ce66d01@huawei.com/T/#t V2: - run .cleanup_rq() in blk_mq_free_request(), as suggested by Mike Ming Lei (2): blk-mq: add callback of .cleanup_rq scsi: implement .cleanup_rq callback block/blk-mq.c | 3 +++ drivers/scsi/scsi_lib.c | 28 ++++++++++++++++++++-------- include/linux/blk-mq.h | 7 +++++++ 3 files changed, 30 insertions(+), 8 deletions(-) Cc: Ewan D. Milne Cc: Bart Van Assche Cc: Hannes Reinecke Cc: Christoph Hellwig Cc: Mike Snitzer Cc: dm-devel@redhat.com Cc: Fixes: 396eaf21ee17 ("blk-mq: improve DM's blk-mq IO merging via blk_insert_cloned_request feedback") -- 2.20.1