mdns: Fix parsing non-standard queries

Fix for packets containing unexpected domains, such as openthread.thread.home.arpa.
If we find this packet we set the name entry as invalid, but continue with parsing as the packet might contain related queries for us.

Closes https://github.com/espressif/esp-idf/issues/7694

components/mdns/mdns.c

@@ -310,6 +310,7 @@ static const uint8_t * _mdns_read_fqdn(const uint8_t * packet, const uint8_t * s
             buf[len] = '\0';
             if (name->parts == 1 && buf[0] != '_'
                     && (strcasecmp(buf, MDNS_DEFAULT_DOMAIN) != 0)
+                    && (strcasecmp(buf, "arpa") != 0)
                     && (strcasecmp(buf, "ip6") != 0)
                     && (strcasecmp(buf, "in-addr") != 0)) {
                 strlcat(name->host, ".", sizeof(name->host));
@@ -2793,7 +2794,8 @@ static const uint8_t * _mdns_parse_fqdn(const uint8_t * packet, const uint8_t *
     if (strcasecmp(name->domain, MDNS_DEFAULT_DOMAIN) == 0 || strcasecmp(name->domain, "arpa") == 0) {
         return next_data;
     }
-    return 0;
+    name->invalid = true; // mark the current name invalid, but continue with other question
+    return next_data;
 }
 
 /**