From 5358380c5fe2a0a284d9597c858641bb18e49871 Mon Sep 17 00:00:00 2001
From: Dirk Ziegelmeier <dirk@ziegelmeier.net>
Date: Thu, 3 Mar 2016 16:12:20 +0100
Subject: [PATCH] Apply patch from Derek Pravala: Fix segfault in ip6_route
 when there is no default netif

---
 src/core/ipv6/ip6.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/core/ipv6/ip6.c b/src/core/ipv6/ip6.c
index d9eca758..24a5f622 100644
--- a/src/core/ipv6/ip6.c
+++ b/src/core/ipv6/ip6.c
@@ -184,7 +184,7 @@ ip6_route(const ip6_addr_t *src, const ip6_addr_t *dest)
 #endif /* LWIP_NETIF_LOOPBACK && !LWIP_HAVE_LOOPIF */
 
   /* no matching netif found, use default netif, if up */
-  if (!netif_is_up(netif_default) || !netif_is_link_up(netif_default)) {
+  if ((netif_default == NULL) || !netif_is_up(netif_default) || !netif_is_link_up(netif_default)) {
     return NULL;
   }
   return netif_default;