e1000: Avoid infinite loop in processing transmit descriptor (CVE-2015-6815)

e1000: Avoid infinite loop in processing transmit descriptor (CVE-2015-6815)

While processing transmit descriptors, it could lead to an infinite
loop if 'bytes' was to become zero; Add a check to avoid it.

[The guest can force 'bytes' to 0 by setting the hdr_len and mss
descriptor fields to 0.
--Stefan]

upstream-commit-id: b947ac2bf26479e710489739c465c8af336599e7

Signed-off-by: P J P <pjp@fedoraproject.org>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-id: 1441383666-6590-1-git-send-email-stefanha@redhat.com
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>