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avformat/matroskaenc: Check BlockAdditional size before use
Don't read a 64bit number before having checked that the data is at least 8 bytes long. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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@ -2142,9 +2142,13 @@ static int mkv_write_block(AVFormatContext *s, AVIOContext *pb,
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AV_PKT_DATA_MATROSKA_BLOCKADDITIONAL,
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&side_data_size);
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if (side_data) {
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additional_id = AV_RB64(side_data);
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side_data += 8;
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side_data_size -= 8;
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if (side_data_size < 8) {
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side_data_size = 0;
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} else {
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additional_id = AV_RB64(side_data);
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side_data += 8;
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side_data_size -= 8;
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}
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}
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if ((side_data_size && additional_id == 1) || discard_padding) {
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