fake_crc32(unsigned long crc, const void *buff, size_t len)
{
	(void)crc; /* UNUSED */
	(void)buff; /* UNUSED */
	(void)len; /* UNUSED */
	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.