[NETFILTER]: ctnetlink: fix reference count leak

When NFA_NEST exceeds the skb size the protocol reference is leaked.
Signed-off-by: NPatrick McHardy <kaber@trash.net>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/netfilter/ip_conntrack_netlink.c

@@ -153,6 +153,7 @@ ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct ip_conntrack *ct)
 	return ret;
 
 nfattr_failure:
+	ip_conntrack_proto_put(proto);
 	return -1;
 }
 

net/netfilter/nf_conntrack_netlink.c

@@ -161,6 +161,7 @@ ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct)
 	return ret;
 
 nfattr_failure:
+	nf_ct_proto_put(proto);
 	return -1;
 }