  ft_add_renderer( FT_Module  module )
  {
    FT_Library   library = module->library;
    FT_Memory    memory  = library->memory;
    FT_Error     error;
    FT_ListNode  node;


    if ( FT_NEW( node ) )
      goto Exit;

    {
      FT_Renderer         render = FT_RENDERER( module );
      FT_Renderer_Class*  clazz  = (FT_Renderer_Class*)module->clazz;


      render->clazz        = clazz;
      render->glyph_format = clazz->glyph_format;

      /* allocate raster object if needed */
      if ( clazz->glyph_format == FT_GLYPH_FORMAT_OUTLINE &&
           clazz->raster_class->raster_new )
      {
        error = clazz->raster_class->raster_new( memory, &render->raster );
        if ( error )
          goto Fail;

        render->raster_render = clazz->raster_class->raster_render;
        render->render        = clazz->render_glyph;
      }

      /* add to list */
      node->data = module;
      FT_List_Add( &library->renderers, node );

      ft_set_current_renderer( library );
    }

  Fail:
    if ( error )
      FT_FREE( node );

  Exit:
    return error;
  }

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.