From 8466ab59b21257ff254b4c17ef428458bac645d9 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Reimar=20D=C3=B6ffinger?= <Reimar.Doeffinger@gmx.de>
Date: Mon, 14 Sep 2009 15:44:05 +0000
Subject: [PATCH] Check buffer size for idcin check, otherwise false positives
 are too likely for small probe buffer sizes due to 0-padding (see probetest
 results).

Originally committed as revision 19838 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/idcin.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/libavformat/idcin.c b/libavformat/idcin.c
index 0a5f825df6..8e9dfb57c3 100644
--- a/libavformat/idcin.c
+++ b/libavformat/idcin.c
@@ -105,6 +105,11 @@ static int idcin_probe(AVProbeData *p)
      * audio channels: 0 for no audio, or 1 or 2
      */
 
+    /* check we have enough data to do all checks, otherwise the
+       0-padding may cause a wrong recognition */
+    if (p->buf_size < 20)
+        return 0;
+
     /* check the video width */
     number = AV_RL32(&p->buf[0]);
     if ((number == 0) || (number > 1024))