BugLink: http://bugs.launchpad.net/bugs/1572722

commit c55aee1b upstream.

An attack using missing endpoints exists.

CVE-2016-3137
Signed-off-by: Oliver Neukum <ONeukum@suse.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Tim Gardner <tim.gardner@canonical.com>