ipvs: info leak in __ip_vs_get_dest_entries()

The entry struct has a 2 byte hole after ->port and another 4 byte
hole after ->stats.outpkts.  You must have CAP_NET_ADMIN in your
namespace to hit this information leak.
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/ipvs/ip_vs_ctl.c

@@ -2542,6 +2542,7 @@ __ip_vs_get_dest_entries(struct net *net, const struct ip_vs_get_dests *get,
 		struct ip_vs_dest *dest;
 		struct ip_vs_dest_entry entry;
 
+		memset(&entry, 0, sizeof(entry));
 		list_for_each_entry(dest, &svc->destinations, n_list) {
 			if (count >= get->num_dests)
 				break;