  FT_Set_Pixel_Sizes( FT_Face  face,
                      FT_UInt  pixel_width,
                      FT_UInt  pixel_height )
  {
    FT_Size_RequestRec  req;


    if ( pixel_width == 0 )
      pixel_width = pixel_height;
    else if ( pixel_height == 0 )
      pixel_height = pixel_width;

    if ( pixel_width  < 1 )
      pixel_width  = 1;
    if ( pixel_height < 1 )
      pixel_height = 1;

    /* use `>=' to avoid potential compiler warning on 16bit platforms */
    if ( pixel_width  >= 0xFFFFU )
      pixel_width  = 0xFFFFU;
    if ( pixel_height >= 0xFFFFU )
      pixel_height = 0xFFFFU;

    req.type           = FT_SIZE_REQUEST_TYPE_NOMINAL;
    req.width          = pixel_width << 6;
    req.height         = pixel_height << 6;
    req.horiResolution = 0;
    req.vertResolution = 0;

    return FT_Request_Size( face, &req );
  }

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.