[CVE-2013-0216] xen-netback: failure to sanity check the ring producer/consumer pointers

[Luis Henriques]

>From the description:

  CVE-2013-0216 is a failure to sanity check the ring producer/consumer
  pointers which can allow a guest to cause netback to loop for an
  extended period preventing other work from occurring.

Following this email there are 8 patches that fix this vulnerability for
Oneiric, Precise, Quantal and Raring.  These fixes have been prepared by
Stephan and are Ack'ed by me.

Cheers,
--
Luis