gailcombobox.c:244:

  combo_box = GTK_COMBO_BOX (widget);
  gail_combo_box = GAIL_COMBO_BOX (obj);
  g_free (gail_combo_box->name);
  if (gtk_combo_box_get_active_iter (combo_box, &iter))

The free is bogus since we then return gail_combo_box->name unconditionally, even if we don't execute the codepath which assigns a new value.

Instead we should explicitly g_strdup() the string value and g_free() the name in the same block, and use g_value_unset() to clean up the GValue struct used to obtain the name string.