Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752546AbeANWBD (ORCPT + 1 other); Sun, 14 Jan 2018 17:01:03 -0500 Received: from smtp.infotech.no ([82.134.31.41]:59055 "EHLO smtp.infotech.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751128AbeANWBC (ORCPT ); Sun, 14 Jan 2018 17:01:02 -0500 From: Douglas Gilbert To: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org Cc: axboe@kernel.dk, bart.vanassche@wdc.com, dvyukov@google.com Subject: [PATCH] blk_rq_map_user_iov: fix error override Date: Sun, 14 Jan 2018 17:00:48 -0500 Message-Id: <20180114220048.8114-1-dgilbert@interlog.com> X-Mailer: git-send-email 2.14.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Return-Path: During stress tests by syzkaller on the sg driver the block layer infrequently returns EINVAL. Closer inspection shows the block layer was trying to return ENOMEM (which is much more understandable) but for some reason overroad that useful error. Patch below does not show this (unchanged) line: ret =__blk_rq_map_user_iov(rq, map_data, &i, gfp_mask, copy); That 'ret' was being overridden when that function failed. Signed-off-by: Douglas Gilbert --- block/blk-map.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/block/blk-map.c b/block/blk-map.c index d3a94719f03f..db9373bd31ac 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -119,7 +119,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, unsigned long align = q->dma_pad_mask | queue_dma_alignment(q); struct bio *bio = NULL; struct iov_iter i; - int ret; + int ret = -EINVAL; if (!iter_is_iovec(iter)) goto fail; @@ -148,7 +148,7 @@ int blk_rq_map_user_iov(struct request_queue *q, struct request *rq, __blk_rq_unmap_user(bio); fail: rq->bio = NULL; - return -EINVAL; + return ret; } EXPORT_SYMBOL(blk_rq_map_user_iov); -- 2.14.1