fix minor overflow in demux_mkv.c#17930
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kasper93
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May 16, 2026
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parse_vorbis_chmap in demux/demux_mkv.c:
vendor_length + 4 > sizeoverflows in 32-bit math, and reserves 4 bytes too few for the following num_headers read, letting a crafted Matroska/FLAC file over-read up to 4 bytes past a metadata block. This leads to nothing and is harmless but can easily be fixed.