[SCTP] Handle "no route" case for output handler (jgrimm)

net/sctp/output.c

@@ -429,6 +429,8 @@ int sctp_packet_transmit(sctp_packet_t *packet)
 	}
 
 	nskb->dst = dst_clone(transport->dst);
+	if (!nskb->dst)
+		goto no_route;
 
 	SCTP_DEBUG_PRINTK("***sctp_transmit_packet*** skb length %d\n",
 			  nskb->len);
@@ -436,6 +438,11 @@ int sctp_packet_transmit(sctp_packet_t *packet)
 out:
 	packet->size = SCTP_IP_OVERHEAD;
 	return err;
+no_route:
+	kfree_skb(nskb);
+	IP_INC_STATS_BH(IpOutNoRoutes);
+	err = -EHOSTUNREACH;
+	goto out;
 }
 
 /********************************************************************

net/sctp/protocol.c

@@ -227,9 +227,12 @@ struct dst_entry *sctp_v4_get_dst(union sctp_addr *daddr,
 				  union sctp_addr *saddr)
 {
 	struct rtable *rt;
-	struct flowi fl = { .nl_u = { .ip4_u = { .daddr =
-						    daddr->v4.sin_addr.s_addr,
-					       } } };
+	struct flowi fl = { 
+		.nl_u = { 
+			.ip4_u = { .daddr =
+				   daddr->v4.sin_addr.s_addr, }}, 
+		.proto = IPPROTO_SCTP,
+	};
 
 	if (saddr)
 		fl.fl4_src = saddr->v4.sin_addr.s_addr;