bug 217: Handle gracefully the case where a packet aggregated contains nothing.

2008-06-20 15:06:23 -07:00
parent 4743c2ff7c
commit da514b5edb
1 changed files with 6 additions and 0 deletions
--- a/src/common/packet-metadata.cc
+++ b/src/common/packet-metadata.cc
@@ -726,6 +726,12 @@ PacketMetadata::AddAtEnd (PacketMetadata const&o)
      *this = o;
      return;
    }
+  if (o.m_head == 0xffff)
+    {
+      NS_ASSERT (o.m_tail == 0xffff);
+      // we have nothing to append.
+      return;
+    }
  NS_ASSERT (m_head != 0xffff && m_tail != 0xffff);

  // We read the current tail because we are going to append