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MIDI: Fix Standard MIDI processor to handle edge cases like non-track chunks in the files

CQTexperiment
Christopher Snowhill 2021-03-29 00:32:44 -07:00
parent 0ecc2d4084
commit 2925c2e733
1 changed files with 8 additions and 3 deletions
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11
Frameworks/midi_processing/midi_processing/midi_processor_standard_midi.cpp
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@ -7,7 +7,6 @@ bool midi_processor::is_standard_midi( std::vector<uint8_t> const& p_file )
if ( p_file[ 4 ] != 0 || p_file[ 5 ] != 0 || p_file[ 6 ] != 0 || p_file[ 7 ] != 6 ) return false;
if ( p_file[ 10 ] == 0 && p_file[ 11 ] == 0 ) return false; // no tracks
if ( p_file[ 12 ] == 0 && p_file[ 13 ] == 0 ) return false; // dtx == 0, will cause division by zero on tempo calculations
if ( p_file[ 14 ] != 'M' || p_file[ 15 ] != 'T' || p_file[ 16 ] != 'r' || p_file[ 17 ] != 'k' ) return false;
return true;
}
@ -195,10 +194,16 @@ bool midi_processor::process_standard_midi( std::vector<uint8_t> const& p_file,
for ( std::size_t i = 0; i < track_count; ++i )
{
if ( end - it < 8 ) return false;
if ( it[0] != 'M' || it[1] != 'T' || it[2] != 'r' || it[3] != 'k' ) return false;
while ( it[0] != 'M' || it[1] != 'T' || it[2] != 'r' || it[3] != 'k' ) {
uint32_t chunk_size = ( it[4] << 24 ) | ( it[5] << 16 ) | ( it[6] << 8 ) | it[7];
if ( (unsigned long)(end - it) < 8 + chunk_size )
return false;
it += 8 + chunk_size;
if ( end - it < 8 ) return false;
}
uint32_t track_size = ( it[4] << 24 ) | ( it[5] << 16 ) | ( it[6] << 8 ) | it[7];
if ( (unsigned long)(end - it) < track_size ) return false;
if ( (unsigned long)(end - it) < 8 + track_size ) return false;
it += 8;