png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,
   png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y,
   png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,
   png_fixed_point blue_y)
{
#ifdef PNG_USE_LOCAL_ARRAYS
   PNG_cHRM;
#endif
   png_byte buf[32];

   png_debug(1, "in png_write_cHRM");

   /* Each value is saved in 1/100,000ths */
#ifdef PNG_CHECK_cHRM_SUPPORTED
   if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y,
      green_x, green_y, blue_x, blue_y))
#endif
   {
      png_save_uint_32(buf, (png_uint_32)white_x);
      png_save_uint_32(buf + 4, (png_uint_32)white_y);

      png_save_uint_32(buf + 8, (png_uint_32)red_x);
      png_save_uint_32(buf + 12, (png_uint_32)red_y);

      png_save_uint_32(buf + 16, (png_uint_32)green_x);
      png_save_uint_32(buf + 20, (png_uint_32)green_y);

      png_save_uint_32(buf + 24, (png_uint_32)blue_x);
      png_save_uint_32(buf + 28, (png_uint_32)blue_y);

      png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
   }
}

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.