vhost: fix split ring potential buffer overflow

[ upstream commit 134228c ]

In vhost datapath, descriptor's length are mostly used in two coherent
operations. First step is used for address translation, second step is
used for memory transaction from guest to host. But the interval between
two steps will give a window for malicious guest, in which can change
descriptor length after vhost calculated buffer size. Thus may lead to
buffer overflow in vhost side. This potential risk can be eliminated by
accessing the descriptor length once.

Fixes: 1be4ebb ("vhost: support indirect descriptor in mergeable Rx")

Signed-off-by: Marvin Liu <yong.liu@intel.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>

lib/librte_vhost/virtio_net.c

@@ -571,10 +571,11 @@ fill_vec_buf_split(struct virtio_net *dev, struct vhost_virtqueue *vq,
 			return -1;
 		}
 
-		len += descs[idx].len;
+		dlen = descs[idx].len;
+		len += dlen;
 
 		if (unlikely(map_one_desc(dev, vq, buf_vec, &vec_id,
-						descs[idx].addr, descs[idx].len,
+						descs[idx].addr, dlen,
 						perm))) {
 			free_ind_table(idesc);
 			return -1;