If the keycode range exceeds the allowable length, memory gets overwritten. Catch this case by making sure that only allowed class types are present. X.Org Bug 25492 <http://bugs.freedesktop.org/show_bug.cgi?id=25492> Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net> Reviewed-by: Dave Airlie <airlied@redhat.com> Signed-off-by: Keith Packard <keithp@keithp.com>