static int get_classes_callback(void *k, void *d, void *args)
{
	struct class_datum *datum = d;
	char *name = k, **classes = args;
	int value = datum->value - 1;

	classes[value] = kstrdup(name, GFP_ATOMIC);
	if (!classes[value])
		return -ENOMEM;

	return 0;
}

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.