vhost: validate vhost_get_vq_desc return value
authorMichael S. Tsirkin <mst@redhat.com>
Thu, 27 Mar 2014 10:53:37 +0000 (12:53 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sun, 27 Apr 2014 00:13:17 +0000 (17:13 -0700)
commit1bc0f3b76f86de85baa45a5e64cf5970095d2925
treeaef0c4a5e425631bbd9db01439e5d11714a1577b
parent20a51abb07a34a3af96b4fffac08022763f74c93
vhost: validate vhost_get_vq_desc return value

[ Upstream commit a39ee449f96a2cd44ce056d8a0a112211a9b1a1f ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/vhost/net.c