From 24ca250d2e814179b4bd9a85e6659e598ec5379f Mon Sep 17 00:00:00 2001
From: Erik Zandvliet <erik.zandvliet@ddvtech.com>
Date: Tue, 17 May 2016 10:56:28 +0200
Subject: [PATCH] Prevent 0-pointer accesses.

---
 lib/dtscmeta.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/lib/dtscmeta.cpp b/lib/dtscmeta.cpp
index 805e0ffa..24cd144e 100644
--- a/lib/dtscmeta.cpp
+++ b/lib/dtscmeta.cpp
@@ -1579,6 +1579,10 @@ namespace DTSC {
 
   ///\brief Writes a track to a pointer
   void Track::writeTo(char *& p) {
+    std::deque<Fragment>::iterator firstFrag = fragments.begin(); 
+    if (fragments.size() && (&firstFrag) == 0){
+      return;
+    }
     std::string trackIdent = getWritableIdentifier();
     writePointer(p, convertShort(trackIdent.size()), 2);
     writePointer(p, trackIdent);