From 729fa55b8f4250b2fee7f4a511372d0b9f696389 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 19 May 2013 23:38:01 +0200
Subject: [PATCH] avformat/matroskadec: fix integer overflow

Fixes fate-mkv with ekopath 4

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/matroskadec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 648941e57f..fc3e4f0f88 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -2284,7 +2284,7 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
         return res;
     av_assert1(block_duration != AV_NOPTS_VALUE);
 
-    block_time = AV_RB16(data);
+    block_time = sign_extend(AV_RB16(data), 16);
     data += 2;
     flags = *data++;
     size -= 3;
-- 
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