From 300d6d87199d18e54d1b4ea1e454f43b21c600c5 Mon Sep 17 00:00:00 2001
From: James Zern <jzern@google.com>
Date: Wed, 19 Apr 2017 23:24:27 -0700
Subject: [PATCH] CuePoint::Find: check Track pointer

replace assert with a check of the pointer, this is a public function so
should be tolerant of invalid parameters

BUG=webm:1415

Change-Id: I28a3a2ef905d62f11928dbbe54c119411d2b1f74
---
 mkvparser/mkvparser.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/mkvparser/mkvparser.cc b/mkvparser/mkvparser.cc
index 6e1c26e..a3995de 100644
--- a/mkvparser/mkvparser.cc
+++ b/mkvparser/mkvparser.cc
@@ -2430,7 +2430,9 @@ bool CuePoint::TrackPosition::Parse(IMkvReader* pReader, long long start_,
 }
 
 const CuePoint::TrackPosition* CuePoint::Find(const Track* pTrack) const {
-  assert(pTrack);
+  if (pTrack == NULL) {
+    return NULL;
+  }
 
   const long long n = pTrack->GetNumber();