mpls: validate L2 via address length
If an L2 via address for an mpls nexthop is specified, the length of the L2 address must match that expected by the output device, otherwise it could access memory beyond the end of the via address buffer in the route. This check was present prior to commit f8efb73c ("mpls: multipath route support"), but got lost in the refactoring, so add it back, applying it to all nexthops in multipath routes. Fixes: f8efb73c ("mpls: multipath route support") Signed-off-by: NRobert Shearman <rshearma@brocade.com> Acked-by: NRoopa Prabhu <roopa@cumulusnetworks.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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