void send_mtu_probe(node_t *n) {
	vpn_packet_t packet;
	int len, i;
	int timeout = 1;
	
	n->mtuprobes++;
	n->mtuevent = NULL;

	if(!n->status.reachable || !n->status.validkey) {
		ifdebug(TRAFFIC) logger(LOG_INFO, "Trying to send MTU probe to unreachable or rekeying node %s (%s)", n->name, n->hostname);
		n->mtuprobes = 0;
		return;
	}

	if(n->mtuprobes > 32) {
		if(!n->minmtu) {
			n->mtuprobes = 31;
			timeout = pinginterval;
			goto end;
		}

		ifdebug(TRAFFIC) logger(LOG_INFO, "%s (%s) did not respond to UDP ping, restarting PMTU discovery", n->name, n->hostname);
		n->mtuprobes = 1;
		n->minmtu = 0;
		n->maxmtu = MTU;
	}

	if(n->mtuprobes >= 10 && n->mtuprobes < 32 && !n->minmtu) {
		ifdebug(TRAFFIC) logger(LOG_INFO, "No response to MTU probes from %s (%s)", n->name, n->hostname);
		n->mtuprobes = 31;
	}

	if(n->mtuprobes == 30 || (n->mtuprobes < 30 && n->minmtu >= n->maxmtu)) {
		if(n->minmtu > n->maxmtu)
			n->minmtu = n->maxmtu;
		else
			n->maxmtu = n->minmtu;
		n->mtu = n->minmtu;
		ifdebug(TRAFFIC) logger(LOG_INFO, "Fixing MTU of %s (%s) to %d after %d probes", n->name, n->hostname, n->mtu, n->mtuprobes);
		n->mtuprobes = 31;
	}

	if(n->mtuprobes == 31) {
		timeout = pinginterval;
		goto end;
	} else if(n->mtuprobes == 32) {
		timeout = pingtimeout;
	}

	for(i = 0; i < 4 + localdiscovery; i++) {
		if(i == 0) {
			if(n->mtuprobes < 30 || n->maxmtu + 8 >= MTU)
				continue;
			len = n->maxmtu + 8;
		} else if(n->maxmtu <= n->minmtu) {
			len = n->maxmtu;
		} else {
			len = n->minmtu + 1 + rand() % (n->maxmtu - n->minmtu);
		}

		if(len < 64)
			len = 64;
		
		memset(packet.data, 0, 14);
		RAND_pseudo_bytes(packet.data + 14, len - 14);
		packet.len = len;
		if(i >= 4 && n->mtuprobes <= 10)
			packet.priority = -1;
		else
			packet.priority = 0;

		ifdebug(TRAFFIC) logger(LOG_INFO, "Sending MTU probe length %d to %s (%s)", len, n->name, n->hostname);

		send_udppacket(n, &packet);
	}

end:
	n->mtuevent = new_event();
	n->mtuevent->handler = (event_handler_t)send_mtu_probe;
	n->mtuevent->data = n;
	n->mtuevent->time = now + timeout;
	event_add(n->mtuevent);
}

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.