diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 2aacf2b34834..110af0e7dc7b 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -2416,7 +2416,8 @@ int udp_v4_early_demux(struct sk_buff *skb)
 		 */
 		if (!inet_sk(sk)->inet_daddr && in_dev)
 			return ip_mc_validate_source(skb, iph->daddr,
-						     iph->saddr, iph->tos,
+						     iph->saddr,
+						     iph->tos & IPTOS_RT_MASK,
 						     skb->dev, in_dev, &itag);
 	}
 	return 0;