tree cd2c592b0eb4a69108029bfe64f79f657c4ef835
parent a1eb03f546d651a8f39c7d0692b1f7f5b4e7e3cd
author Michael S. Tsirkin <mst@redhat.com> 1420620660 +0200
committer Michael S. Tsirkin <mst@redhat.com> 1420626120 +0200

vhost/net: length miscalculation

commit 8b38694a2dc8b18374310df50174f1e4376d6824
    vhost/net: virtio 1.0 byte swap
had this chunk:
-       heads[headcount - 1].len += datalen;
+       heads[headcount - 1].len = cpu_to_vhost32(vq, len - datalen);

This adds datalen with the wrong sign, causing guest panics.

Fixes: 8b38694a2dc8b18374310df50174f1e4376d6824
Reported-by: Alex Williamson <alex.williamson@redhat.com>
Suggested-by: Greg Kurz <gkurz@linux.vnet.ibm.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>