From 2899843900e7f233fdaea7bb7543efa6a7f9afac Mon Sep 17 00:00:00 2001
From: Cameron Gutman <aicommander@gmail.com>
Date: Mon, 5 Nov 2018 19:43:50 -0800
Subject: [PATCH] Avoid using IPv6 FC if no control URL was present

---
 miss/miss.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/miss/miss.cpp b/miss/miss.cpp
index aeda39b..f69bf54 100644
--- a/miss/miss.cpp
+++ b/miss/miss.cpp
@@ -304,6 +304,11 @@ bool UPnPHandleDeviceList(struct UPNPDev* list, bool ipv6, bool enable)
         return false;
     }
 
+    if (data.IPv6FC.controlurl[0] == 0) {
+        printf("IPv6 firewall control not supported by UPnP IGD!" NL);
+        return false;
+    }
+
     if (ipv6) {
         // Convert what is likely a IPv6 temporary address into
         // the stable IPv6 address for the same interface.