Commit a39ee449 authored Mar 27, 2014 by Michael S. Tsirkin Committed by David S. Miller Mar 28, 2014

vhost: validate vhost_get_vq_desc return value



vhost fails to validate negative error code
from vhost_get_vq_desc causing
a crash: we are using -EFAULT which is 0xfffffff2
as vector size, which exceeds the allocated size.

The code in question was introduced in commit
8dd014ad
    vhost-net: mergeable buffers support

CVE-2014-0055

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

parent d8316f39

drivers/vhost/net.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -505,9 +505,13 @@ static int get_rx_bufs(struct vhost_virtqueue *vq,
		r = -ENOBUFS;
		goto err;
		}
		d = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg,
		r = vhost_get_vq_desc(vq->dev, vq, vq->iov + seg,
		ARRAY_SIZE(vq->iov) - seg, &out,
		&in, log, log_num);
		if (unlikely(r < 0))
		goto err;

		d = r;
		if (d == vq->num) {
		r = 0;
		goto err;