check_valid_pointer
if (!object || !check_valid_pointer(s, slab, object)) {
!check_valid_pointer(s, slab, get_freepointer(s, p))) {
if (!check_valid_pointer(s, slab, fp)) {
if (!check_valid_pointer(s, slab, object)) {
if (!check_valid_pointer(s, slab, object)) {