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9p/virtio: fix off-by-one error in sg list bounds check

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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.

Link: http://lkml.kernel.org/r/5B63D5F6.6080109@huawei.com
Signed-off-by: Yiwen Jiang <jiangyiwen@huawei.com>
Reported-By: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Jun Piao <piaojun@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Dominique Martinet <dominique.martinet@cea.fr>
This commit is contained in:
jiangyiwen 2018-08-03 12:11:34 +08:00 committed by Dominique Martinet
parent c69f297d7f
commit 23cba9cbde
1 changed files with 2 additions and 1 deletions
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3
net/9p/trans_virtio.c
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@ -191,7 +191,7 @@ static int pack_sg_list(struct scatterlist *sg, int start,
s = rest_of_page(data); s = rest_of_page(data);
if (s > count) if (s > count)
s = count; s = count;
BUG_ON(index > limit); BUG_ON(index >= limit);
/* Make sure we don't terminate early. */ /* Make sure we don't terminate early. */
sg_unmark_end(&sg[index]); sg_unmark_end(&sg[index]);
sg_set_buf(&sg[index++], data, s); sg_set_buf(&sg[index++], data, s);
@ -236,6 +236,7 @@ pack_sg_list_p(struct scatterlist *sg, int start, int limit,
s = PAGE_SIZE - data_off; s = PAGE_SIZE - data_off;
if (s > count) if (s > count)
s = count; s = count;
BUG_ON(index >= limit);
/* Make sure we don't terminate early. */ /* Make sure we don't terminate early. */
sg_unmark_end(&sg[index]); sg_unmark_end(&sg[index]);
sg_set_page(&sg[index++], pdata[i++], s, data_off); sg_set_page(&sg[index++], pdata[i++], s, data_off);