  cff_free_glyph_data( TT_Face    face,
                       FT_Byte**  pointer,
                       FT_ULong   length )
  {
#ifndef FT_CONFIG_OPTION_INCREMENTAL
    FT_UNUSED( length );
#endif

#ifdef FT_CONFIG_OPTION_INCREMENTAL
    /* For incremental fonts get the character data using the */
    /* callback function.                                     */
    if ( face->root.internal->incremental_interface )
    {
      FT_Data data;


      data.pointer = *pointer;
      data.length  = length;

      face->root.internal->incremental_interface->funcs->free_glyph_data(
        face->root.internal->incremental_interface->object, &data );
    }
    else
#endif /* FT_CONFIG_OPTION_INCREMENTAL */

    {
      CFF_Font  cff = (CFF_Font)(face->extra.data);


      cff_index_forget_element( &cff->charstrings_index, pointer );
    }
  }

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.