avformat/matroskadec: fix integer overflow
Fixes fate-mkv with ekopath 4 Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -2284,7 +2284,7 @@ static int matroska_parse_block(MatroskaDemuxContext *matroska, uint8_t *data,
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return res;
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return res;
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av_assert1(block_duration != AV_NOPTS_VALUE);
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av_assert1(block_duration != AV_NOPTS_VALUE);
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block_time = AV_RB16(data);
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block_time = sign_extend(AV_RB16(data), 16);
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data += 2;
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data += 2;
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flags = *data++;
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flags = *data++;
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size -= 3;
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size -= 3;
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