From mboxrd@z Thu Jan 1 00:00:00 1970 From: jiangyiwen Subject: [V9fs-developer] [PATCH] net/9p: Modify the problem of BUG_ON judgment Date: Fri, 3 Aug 2018 12:11:34 +0800 Message-ID: <5B63D5F6.6080109@huawei.com> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: Linux Kernel Mailing List , , To: Eric Van Hensbergen , Ron Minnich , Latchesar Ionkov , Dominique Martinet Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Because the value of limit is VIRTQUEUE_NUM, if index is equal to limit, it will cause sg array out of bounds, so correct the judgement of BUG_ON. Signed-off-by: Yiwen Jiang --- net/9p/trans_virtio.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index 6265d1d..08264ba 100644 --- a/net/9p/trans_virtio.c +++ b/net/9p/trans_virtio.c @@ -191,7 +191,7 @@ static int pack_sg_list(struct scatterlist *sg, int start, s = rest_of_page(data); if (s > count) s = count; - BUG_ON(index > limit); + BUG_ON(index >= limit); /* Make sure we don't terminate early. */ sg_unmark_end(&sg[index]); sg_set_buf(&sg[index++], data, s); @@ -236,6 +236,7 @@ static int p9_virtio_cancel(struct p9_client *client, struct p9_req_t *req) s = PAGE_SIZE - data_off; if (s > count) s = count; + BUG_ON(index >= limit); /* Make sure we don't terminate early. */ sg_unmark_end(&sg[index]); sg_set_page(&sg[index++], pdata[i++], s, data_off); -- 1.8.3.1