static NOINLINE int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr)
{
	struct dhcp_packet packet;

/*
 * RFC 2131 4.3.2 DHCPREQUEST message
 * ...
 * DHCPREQUEST generated during RENEWING state:
 *
 * 'server identifier' MUST NOT be filled in, 'requested IP address'
 * option MUST NOT be filled in, 'ciaddr' MUST be filled in with
 * client's IP address. In this situation, the client is completely
 * configured, and is trying to extend its lease. This message will
 * be unicast, so no relay agents will be involved in its
 * transmission.  Because 'giaddr' is therefore not filled in, the
 * DHCP server will trust the value in 'ciaddr', and use it when
 * replying to the client.
 */
	/* Fill in: op, htype, hlen, cookie, chaddr fields,
	 * random xid field (we override it below),
	 * client-id option (unless -C), message type option:
	 */
	init_packet(&packet, DHCPREQUEST);

	packet.xid = xid;
	packet.ciaddr = ciaddr;

	/* Add options: maxsize,
	 * optionally: hostname, fqdn, vendorclass,
	 * "param req" option according to -O, and options specified with -x
	 */
	add_client_options(&packet);

	bb_info_msg("Sending renew...");
	return bcast_or_ucast(&packet, ciaddr, server);
}

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.