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| author | jiangyiwen <jiangyiwen@huawei.com> | 2018-08-03 12:11:34 +0800 |
|---|---|---|
| committer | Dominique Martinet <dominique.martinet@cea.fr> | 2018-08-13 09:35:28 +0900 |
| commit | 23cba9cbde0bba05d772b335fe5f66aa82b9ad19 (patch) | |
| tree | 3a25c5676e7d7d273119fbb08120ace47eb25a1e /net/9p | |
| parent | c69f297d7f0b46187919d5c2aa36183688ecf3d4 (diff) | |
| download | linux-23cba9cbde0bba05d772b335fe5f66aa82b9ad19.tar.gz linux-23cba9cbde0bba05d772b335fe5f66aa82b9ad19.tar.bz2 linux-23cba9cbde0bba05d772b335fe5f66aa82b9ad19.zip | |
9p/virtio: fix off-by-one error in sg list bounds check
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>
Diffstat (limited to 'net/9p')
| -rw-r--r-- | net/9p/trans_virtio.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c index 6265d1d62749..08264bae3f5d 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 @@ pack_sg_list_p(struct scatterlist *sg, int start, int limit, 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); |