evutil_make_tcp_listen_socket_deferred(evutil_socket_t sock)
{
#if defined(EVENT__HAVE_NETINET_TCP_H) && defined(TCP_DEFER_ACCEPT)
	int one = 1;

	/* TCP_DEFER_ACCEPT tells the kernel to call defer accept() only after data
	 * has arrived and ready to read */ 
	return setsockopt(sock, IPPROTO_TCP, TCP_DEFER_ACCEPT, &one,
		(ev_socklen_t)sizeof(one)); 
#endif
	return 0;
}

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.