struct acpi_namespace_node *acpi_ns_validate_handle(acpi_handle handle)
{

	ACPI_FUNCTION_ENTRY();

	/* Parameter validation */

	if ((!handle) || (handle == ACPI_ROOT_OBJECT)) {
		return (acpi_gbl_root_node);
	}

	/* We can at least attempt to verify the handle */

	if (ACPI_GET_DESCRIPTOR_TYPE(handle) != ACPI_DESC_TYPE_NAMED) {
		return (NULL);
	}

	return (ACPI_CAST_PTR(struct acpi_namespace_node, handle));
}

The product does not handle or incorrectly handles an exceptional condition.