9p: BUG before corrupting memory

[platform/adaptation/renesas_rcar/renesas_kernel.git] / net / 9p / trans_virtio.c

diff --git a/net/9p/trans_virtio.c b/net/9p/trans_virtio.c
index 5af18d1..2a16765 100644 (file)
--- a/net/9p/trans_virtio.c
+++ b/net/9p/trans_virtio.c
@@ -192,10 +192,10 @@ static int pack_sg_list(struct scatterlist *sg, int start,
                s = rest_of_page(data);
                if (s > count)
                        s = count;
+               BUG_ON(index > limit);
                sg_set_buf(&sg[index++], data, s);
                count -= s;
                data += s;
-               BUG_ON(index > limit);
        }
 
        return index-start;