--- x/net/ipv4/route.c
+++ y/net/ipv4/route.c
@@ -2478,7 +2478,7 @@ ip_route_input_rcu(struct sk_buff *skb,
 		int our = 0;
 
 		if (!in_dev)
-			return -EINVAL;
+			return reason;
 		our = ip_check_mc_rcu(in_dev, daddr, saddr,
 				      ip_hdr(skb)->protocol);