static int bson_string_is_db_ref( const unsigned char *string, const int length ) {
    int result = 0;

    if( length >= 4 ) {
        if( string[1] == 'r' && string[2] == 'e' && string[3] == 'f' )
            result = 1;
    }
    else if( length >= 3 ) {
        if( string[1] == 'i' && string[2] == 'd' )
            result = 1;
        else if( string[1] == 'd' && string[2] == 'b' )
            result = 1;
    }

    return result;
}
The software performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value. This can introduce other weaknesses when the calculation is used for resource management or execution control.