static inline void delete_item(struct pppoe_net *pn, __be16 sid,
					char *addr, int ifindex)
{
	write_lock_bh(&pn->hash_lock);
	__delete_item(pn, sid, addr, ifindex);
	write_unlock_bh(&pn->hash_lock);
}

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.