static inline bool mcryptd_check_internal(struct rtattr **tb, u32 *type,
					  u32 *mask)
{
	struct crypto_attr_type *algt;

	algt = crypto_get_attr_type(tb);
	if (IS_ERR(algt))
		return false;

	*type |= algt->type & CRYPTO_ALG_INTERNAL;
	*mask |= algt->mask & CRYPTO_ALG_INTERNAL;

	if (*type & *mask & CRYPTO_ALG_INTERNAL)
		return true;
	else
		return false;
}
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.