  cf2_initGlobalRegionBuffer( CFF_Decoder*  decoder,
                               CF2_UInt      idx,
                               CF2_Buffer    buf )
   {
    FT_ASSERT( decoder && decoder->globals );
 
     FT_ZERO( buf );
 
    idx += decoder->globals_bias;
     if ( idx >= decoder->num_globals )
       return TRUE;     /* error */
 
     buf->start =
     buf->ptr   = decoder->globals[idx];
     buf->end   = decoder->globals[idx + 1];
  }

The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.