load_gimp_2_6_file (gconstpointer data)
{
  Gimp      *gimp = GIMP (data);
  GimpImage *image;
  gchar     *filename;
  GFile     *file;

  filename = g_build_filename (g_getenv ("GIMP_TESTING_ABS_TOP_SRCDIR"),
                               "app/tests/files/gimp-2-6-file.xcf",
                               NULL);
  file = g_file_new_for_path (filename);
  g_free (filename);

  image = gimp_test_load_image (gimp, file);

  /* The image file was constructed by running
   * gimp_write_and_read_file (FALSE, FALSE) in GIMP 2.6 by
   * copy-pasting the code to GIMP 2.6 and adapting it to changes in
   * the core API, so we can use gimp_assert_mainimage() to make sure
   * the file was loaded successfully.
   */
  gimp_assert_mainimage (image,
                         FALSE /*with_unusual_stuff*/,
                         FALSE /*compat_paths*/,
                         FALSE /*use_gimp_2_8_features*/);
}

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.