iperf_defaults(struct iperf_test *testp)
{
    struct protocol *tcp, *udp;

    testp->omit = OMIT;
    testp->duration = DURATION;
    testp->diskfile_name = (char*) 0;
    testp->affinity = -1;
    testp->server_affinity = -1;
    testp->title = NULL;
    testp->congestion = NULL;
    testp->server_port = PORT;
    testp->ctrl_sck = -1;
    testp->prot_listener = -1;

    testp->stats_callback = iperf_stats_callback;
    testp->reporter_callback = iperf_reporter_callback;

    testp->stats_interval = testp->reporter_interval = 1;
    testp->num_streams = 1;

    testp->settings->domain = AF_UNSPEC;
    testp->settings->unit_format = 'a';
    testp->settings->socket_bufsize = 0;    /* use autotuning */
    testp->settings->blksize = DEFAULT_TCP_BLKSIZE;
    testp->settings->rate = 0;
    testp->settings->burst = 0;
    testp->settings->mss = 0;
    testp->settings->bytes = 0;
    testp->settings->blocks = 0;
    memset(testp->cookie, 0, COOKIE_SIZE);

    testp->multisend = 10;	/* arbitrary */

    /* Set up protocol list */
    SLIST_INIT(&testp->streams);
    SLIST_INIT(&testp->protocols);

    tcp = (struct protocol *) malloc(sizeof(struct protocol));
    if (!tcp)
        return -1;
    memset(tcp, 0, sizeof(struct protocol));
    udp = (struct protocol *) malloc(sizeof(struct protocol));
    if (!udp) {
        free(tcp);
        return -1;
    }
    memset(udp, 0, sizeof(struct protocol));

    tcp->id = Ptcp;
    tcp->name = "TCP";
    tcp->accept = iperf_tcp_accept;
    tcp->listen = iperf_tcp_listen;
    tcp->connect = iperf_tcp_connect;
    tcp->send = iperf_tcp_send;
    tcp->recv = iperf_tcp_recv;
    tcp->init = NULL;
    SLIST_INSERT_HEAD(&testp->protocols, tcp, protocols);

    udp->id = Pudp;
    udp->name = "UDP";
    udp->accept = iperf_udp_accept;
    udp->listen = iperf_udp_listen;
    udp->connect = iperf_udp_connect;
    udp->send = iperf_udp_send;
    udp->recv = iperf_udp_recv;
    udp->init = iperf_udp_init;
    SLIST_INSERT_AFTER(tcp, udp, protocols);

    set_protocol(testp, Ptcp);

    testp->on_new_stream = iperf_on_new_stream;
    testp->on_test_start = iperf_on_test_start;
    testp->on_connect = iperf_on_connect;
    testp->on_test_finish = iperf_on_test_finish;

    TAILQ_INIT(&testp->server_output_list);

    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.