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| author | Michael S. Tsirkin <mst@redhat.com> | 2014-03-27 12:53:37 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2014-03-28 16:10:35 -0400 |
| commit | a39ee449f96a2cd44ce056d8a0a112211a9b1a1f (patch) | |
| tree | 0a28633b16e59b3ce6211daf4f34466ad0129430 | |
| parent | d8316f3991d207fe32881a9ac20241be8fa2bad0 (diff) | |
| download | lwn-a39ee449f96a2cd44ce056d8a0a112211a9b1a1f.tar.gz lwn-a39ee449f96a2cd44ce056d8a0a112211a9b1a1f.zip | |
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
8dd014adfea6f173c1ef6378f7e5e7924866c923
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>
| -rw-r--r-- | drivers/vhost/net.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 026be580d318..e1e22e0f01e8 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -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; |