nvmet_fc_alloc_target_assoc(struct nvmet_fc_tgtport *tgtport)
{
	struct nvmet_fc_tgt_assoc *assoc, *tmpassoc;
	unsigned long flags;
	u64 ran;
	int idx;
	bool needrandom = true;

	assoc = kzalloc(sizeof(*assoc), GFP_KERNEL);
	if (!assoc)
		return NULL;

	idx = ida_simple_get(&tgtport->assoc_cnt, 0, 0, GFP_KERNEL);
	if (idx < 0)
		goto out_free_assoc;

	if (!nvmet_fc_tgtport_get(tgtport))
		goto out_ida_put;

	assoc->tgtport = tgtport;
	assoc->a_id = idx;
	INIT_LIST_HEAD(&assoc->a_list);
	kref_init(&assoc->ref);

	while (needrandom) {
		get_random_bytes(&ran, sizeof(ran) - BYTES_FOR_QID);
		ran = ran << BYTES_FOR_QID_SHIFT;

		spin_lock_irqsave(&tgtport->lock, flags);
		needrandom = false;
		list_for_each_entry(tmpassoc, &tgtport->assoc_list, a_list)
			if (ran == tmpassoc->association_id) {
				needrandom = true;
				break;
			}
		if (!needrandom) {
			assoc->association_id = ran;
			list_add_tail(&assoc->a_list, &tgtport->assoc_list);
		}
		spin_unlock_irqrestore(&tgtport->lock, flags);
	}

	return assoc;

out_ida_put:
	ida_simple_remove(&tgtport->assoc_cnt, idx);
out_free_assoc:
	kfree(assoc);
	return NULL;
}

The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.