void sctp_addr_wq_mgmt(struct net *net, struct sctp_sockaddr_entry *addr, int cmd)
{
	struct sctp_sockaddr_entry *addrw;
	unsigned long timeo_val;

	/* first, we check if an opposite message already exist in the queue.
	 * If we found such message, it is removed.
	 * This operation is a bit stupid, but the DHCP client attaches the
	 * new address after a couple of addition and deletion of that address
	 */

	spin_lock_bh(&net->sctp.addr_wq_lock);
	/* Offsets existing events in addr_wq */
	addrw = sctp_addr_wq_lookup(net, addr);
	if (addrw) {
		if (addrw->state != cmd) {
			pr_debug("%s: offsets existing entry for %d, addr:%pISc "
				 "in wq:%p\n", __func__, addrw->state, &addrw->a.sa,
				 &net->sctp.addr_waitq);

			list_del(&addrw->list);
			kfree(addrw);
		}
		spin_unlock_bh(&net->sctp.addr_wq_lock);
		return;
	}

	/* OK, we have to add the new address to the wait queue */
	addrw = kmemdup(addr, sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
	if (addrw == NULL) {
		spin_unlock_bh(&net->sctp.addr_wq_lock);
		return;
	}
	addrw->state = cmd;
	list_add_tail(&addrw->list, &net->sctp.addr_waitq);

	pr_debug("%s: add new entry for cmd:%d, addr:%pISc in wq:%p\n",
		 __func__, addrw->state, &addrw->a.sa, &net->sctp.addr_waitq);

	if (!timer_pending(&net->sctp.addr_wq_timer)) {
		timeo_val = jiffies;
		timeo_val += msecs_to_jiffies(SCTP_ADDRESS_TICK_DELAY);
		mod_timer(&net->sctp.addr_wq_timer, timeo_val);
	}
	spin_unlock_bh(&net->sctp.addr_wq_lock);
}

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.