From 65eb36b10d33527c980e250651ed129f8a251f98 Mon Sep 17 00:00:00 2001
From: Jasper Verschueren <jasper.verschueren@apart-audio.com>
Date: Fri, 19 Oct 2018 16:09:07 +0200
Subject: [PATCH] mDNS: ignore responses with src port != 5353 (rfc6762 section
 6)

---
 src/apps/mdns/mdns.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/apps/mdns/mdns.c b/src/apps/mdns/mdns.c
index 78c9e116..f7240fe2 100644
--- a/src/apps/mdns/mdns.c
+++ b/src/apps/mdns/mdns.c
@@ -1083,6 +1083,12 @@ mdns_handle_response(struct mdns_packet *pkt, struct netif *netif)
 {
   struct mdns_host* mdns = NETIF_TO_HOST(netif);
 
+  /* Ignore responses with a source port different from 5353
+   * (LWIP_IANA_PORT_MDNS) -> RFC6762 section 6 */
+  if (pkt->source_port != LWIP_IANA_PORT_MDNS) {
+    return;
+  }
+
   /* Ignore all questions */
   while (pkt->questions_left) {
     struct mdns_question q;