iperf_send(struct iperf_test *test, fd_set *write_setP)
{
    register int multisend, r, streams_active;
    register struct iperf_stream *sp;
    struct timeval now;

    /* Can we do multisend mode? */
    if (test->settings->burst != 0)
        multisend = test->settings->burst;
    else if (test->settings->rate == 0)
        multisend = test->multisend;
    else
        multisend = 1;	/* nope */

    for (; multisend > 0; --multisend) {
	if (test->settings->rate != 0 && test->settings->burst == 0)
	    gettimeofday(&now, NULL);
	streams_active = 0;
	SLIST_FOREACH(sp, &test->streams, streams) {
	    if (sp->green_light &&
	        (write_setP == NULL || FD_ISSET(sp->socket, write_setP))) {
		if ((r = sp->snd(sp)) < 0) {
		    if (r == NET_SOFTERROR)
			break;
		    i_errno = IESTREAMWRITE;
		    return r;
		}
		streams_active = 1;
		test->bytes_sent += r;
		++test->blocks_sent;
		if (test->settings->rate != 0 && test->settings->burst == 0)
		    iperf_check_throttle(sp, &now);
		if (multisend > 1 && test->settings->bytes != 0 && test->bytes_sent >= test->settings->bytes)
		    break;
		if (multisend > 1 && test->settings->blocks != 0 && test->blocks_sent >= test->settings->blocks)
		    break;
	    }
	}
	if (!streams_active)
	    break;
    }
    if (test->settings->burst != 0) {
	gettimeofday(&now, NULL);
	SLIST_FOREACH(sp, &test->streams, streams)
	    iperf_check_throttle(sp, &now);
    }
    if (write_setP != NULL)
	SLIST_FOREACH(sp, &test->streams, streams)
	    if (FD_ISSET(sp->socket, write_setP))
		FD_CLR(sp->socket, write_setP);

    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.