avformat/matroskadec: fix integer overflow

Fixes fate-mkv with ekopath 4 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
12 years ago · 729fa55b8f
parent 1a5f1bcff0
commit 729fa55b8f
1 changed files with 1 additions and 1 deletions
--- 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;