From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Wenbo Wang , Chong Yuan , Jens Axboe Subject: [PATCH 3.19 018/101] Fix bug in blk_rq_merge_ok Date: Fri, 17 Apr 2015 15:28:06 +0200 Message-Id: <20150417132515.211846532@linuxfoundation.org> In-Reply-To: <20150417132514.379828774@linuxfoundation.org> References: <20150417132514.379828774@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-15 Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: Wenbo Wang commit 7ee8e4f3983c4ff700958a6099c8fd212ea67b94 upstream. Use the right array index to reference the last element of rq->biotail->bi_io_vec[] Signed-off-by: Wenbo Wang Reviewed-by: Chong Yuan Fixes: 66cb45aa41315 ("block: add support for limiting gaps in SG lists") Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- block/blk-merge.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/block/blk-merge.c +++ b/block/blk-merge.c @@ -609,7 +609,7 @@ bool blk_rq_merge_ok(struct request *rq, if (q->queue_flags & (1 << QUEUE_FLAG_SG_GAPS)) { struct bio_vec *bprev; - bprev = &rq->biotail->bi_io_vec[bio->bi_vcnt - 1]; + bprev = &rq->biotail->bi_io_vec[rq->biotail->bi_vcnt - 1]; if (bvec_gap_to_prev(bprev, bio->bi_io_vec[0].bv_offset)) return false; }