tcp: Avoid accessing an empty packet sent list

2017-02-14 11:44:38 -08:00
parent 4b67fc4fb4
commit 03fea775cb
1 changed files with 4 additions and 4 deletions
--- a/src/internet/model/tcp-tx-buffer.cc
+++ b/src/internet/model/tcp-tx-buffer.cc
@@ -1022,13 +1022,13 @@ TcpTxBuffer::IsHeadRetransmitted () const
 {
  NS_LOG_FUNCTION (this);

-  TcpTxItem *item = m_sentList.front ();
-  if (item != 0)
+  if (m_sentSize == 0)
    {
-      return item->m_retrans;
+      return false;
    }

-  return false;
+  NS_ASSERT (m_sentList.size () > 0);
+  return m_sentList.front ()->m_retrans;
 }

 Ptr<const TcpOptionSack>