Commit 2ebd7775 authored Dec 30, 2021 by David Ahern Committed by Greg Kroah-Hartman Jan 11, 2022

ipv6: Check attribute length for RTA_GATEWAY when deleting multipath route



commit 1ff15a710a862db1101b97810af14aedc835a86a upstream.

Make sure RTA_GATEWAY for IPv6 multipath route has enough bytes to hold
an IPv6 address.

Fixes: 6b9ea5a6 ("ipv6: fix multipath route replace error recovery")
Signed-off-by: David Ahern <dsahern@kernel.org>
Cc: Roopa Prabhu <roopa@nvidia.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent a02d2be7

net/ipv6/route.c

+5 −1

Original line number	Diff line number	Diff line
		@@ -5307,7 +5307,11 @@ static int ip6_route_multipath_del(struct fib6_config *cfg,

		nla = nla_find(attrs, attrlen, RTA_GATEWAY);
		if (nla) {
		nla_memcpy(&r_cfg.fc_gateway, nla, 16);
		err = fib6_gw_from_attr(&r_cfg.fc_gateway, nla,
		extack);
		if (err)
		return err;

		r_cfg.fc_flags \|= RTF_GATEWAY;
		}
		}