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fix minor overflow in demux_mkv.c #17930

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fix minor overflow in demux_mkv.c #17930

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3 changes: 2 additions & 1 deletion demux/demux_mkv.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1819,7 +1819,8 @@ static void parse_vorbis_chmap(struct mp_chmap *channels, unsigned char *data,
if (size < 4)
return;
uint32_t vendor_length = AV_RL32(data);
if (vendor_length + 4 > size) // also check for the next AV_RB32 below
// 4 (vendor_length) + vendor string + 4 (num_headers); subtract to avoid overflow
if (size < 8 || vendor_length > size - 8)
return;
size -= vendor_length + 4;
data += vendor_length + 4;
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