Swconfig needs to make sure that requested vlans/ports actually exist,
else it might read or modify memory not belonging to itself.
This patch adds a quick range check in swconfig's kernel part to
prevent accidential or intentional memory modification.
Signed-off-by: Jonas Gorski <jonas.gorski+openwrt@gmail.com>
SVN-Revision: 20811
fba1a0a074