netfilter: ipvs: fix dst leak in __ip_vs_addr_is_local_v6

After call to ip6_route_output() we must release dst or we leak it.

Also should test dst->error, as ip6_route_output() never returns NULL.

Use boolean while we are at it.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

diff --git a/net/netfilter/ipvs/ip_vs_ctl.c b/net/netfilter/ipvs/ip_vs_ctl.c
index dd811b8..d43e3c1 100644 (file)
--- a/net/netfilter/ipvs/ip_vs_ctl.c
+++ b/net/netfilter/ipvs/ip_vs_ctl.c
@@ -76,19 +76,19 @@ static void __ip_vs_del_service(struct ip_vs_service *svc);
 
 #ifdef CONFIG_IP_VS_IPV6
 /* Taken from rt6_fill_node() in net/ipv6/route.c, is there a better way? */
-static int __ip_vs_addr_is_local_v6(struct net *net,
-                                   const struct in6_addr *addr)
+static bool __ip_vs_addr_is_local_v6(struct net *net,
+                                    const struct in6_addr *addr)
 {
-       struct rt6_info *rt;
        struct flowi6 fl6 = {
                .daddr = *addr,
        };
+       struct dst_entry *dst = ip6_route_output(net, NULL, &fl6);
+       bool is_local;
 
-       rt = (struct rt6_info *)ip6_route_output(net, NULL, &fl6);
-       if (rt && rt->dst.dev && (rt->dst.dev->flags & IFF_LOOPBACK))
-               return 1;
+       is_local = !dst->error && dst->dev && (dst->dev->flags & IFF_LOOPBACK);
 
-       return 0;
+       dst_release(dst);
+       return is_local;
 }
 #endif