CVE-2013-4532

Three issues were found:
 * s->next_packet is read from wire as an index into s->rx[].
 * s->tx_fifo_len is read from the wire and later used as an index into
     s->tx_fifo[] when a DATA command is issued by the guest.
 * s->tx_frame_len is read from the wire and can later used as an index
     into s->tx_fifo[] for memset() when a DATA command is issued by the
     guest.

An user able to alter the savevm data (either on the disk or over the wire
during migration) could use this flaw to to corrupt QEMU process memory on
the (destination) host, which could potentially result in arbitrary code
execution on the host with the privileges of the QEMU process.


References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4532
https://bugzilla.redhat.com/show_bug.cgi?id=1066358