From 6547b9222c4b02c8f1fcd61a382dd2d725ee936e Mon Sep 17 00:00:00 2001
From: "Gustavo J. A. M. Carneiro" <gjc@inescporto.pt>
Date: Thu, 15 May 2008 12:56:10 +0100
Subject: [PATCH] GlobalRoutingManager: don't segfault for NetDevices that have
 no associated Channel (e.g. virtual NetDevices); just skip them.

---
 src/routing/global-routing/global-router-interface.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/routing/global-routing/global-router-interface.cc b/src/routing/global-routing/global-router-interface.cc
index 5f8f8ccf2..2816e5308 100644
--- a/src/routing/global-routing/global-router-interface.cc
+++ b/src/routing/global-routing/global-router-interface.cc
@@ -638,6 +638,10 @@ GlobalRouter::DiscoverLSAs (void)
 // router (to use OSPF lingo) is running.  
 //
           Ptr<Channel> ch = ndLocal->GetChannel();
+          if (ch == NULL)
+            {
+              continue;
+            }
           Ptr<NetDevice> ndRemote = GetAdjacent(ndLocal, ch);
 //
 // The adjacent net device is aggregated to a node.  We need to ask that net