static void rtsp_cmd_setup(HTTPContext *c, const char *url,
                           RTSPMessageHeader *h)
{
    FFServerStream *stream;
    int stream_index, rtp_port, rtcp_port;
    char buf[1024];
    char path1[1024];
    const char *path;
    HTTPContext *rtp_c;
    RTSPTransportField *th;
    struct sockaddr_in dest_addr;
    RTSPActionServerSetup setup;

    /* find which URL is asked */
    av_url_split(NULL, 0, NULL, 0, NULL, 0, NULL, path1, sizeof(path1), url);
    path = path1;
    if (*path == '/')
        path++;

    /* now check each stream */
    for(stream = config.first_stream; stream; stream = stream->next) {
        if (stream->is_feed || !stream->fmt ||
            strcmp(stream->fmt->name, "rtp")) {
            continue;
        }
        /* accept aggregate filenames only if single stream */
        if (!strcmp(path, stream->filename)) {
            if (stream->nb_streams != 1) {
                rtsp_reply_error(c, RTSP_STATUS_AGGREGATE);
                return;
            }
            stream_index = 0;
            goto found;
        }

        for(stream_index = 0; stream_index < stream->nb_streams;
            stream_index++) {
            snprintf(buf, sizeof(buf), "%s/streamid=%d",
                     stream->filename, stream_index);
            if (!strcmp(path, buf))
                goto found;
        }
    }
    /* no stream found */
    rtsp_reply_error(c, RTSP_STATUS_SERVICE); /* XXX: right error ? */
    return;
 found:

    /* generate session id if needed */
    if (h->session_id[0] == '\0') {
        unsigned random0 = av_lfg_get(&random_state);
        unsigned random1 = av_lfg_get(&random_state);
        snprintf(h->session_id, sizeof(h->session_id), "%08x%08x",
                 random0, random1);
    }

    /* find RTP session, and create it if none found */
    rtp_c = find_rtp_session(h->session_id);
    if (!rtp_c) {
        /* always prefer UDP */
        th = find_transport(h, RTSP_LOWER_TRANSPORT_UDP);
        if (!th) {
            th = find_transport(h, RTSP_LOWER_TRANSPORT_TCP);
            if (!th) {
                rtsp_reply_error(c, RTSP_STATUS_TRANSPORT);
                return;
            }
        }

        rtp_c = rtp_new_connection(&c->from_addr, stream, h->session_id,
                                   th->lower_transport);
        if (!rtp_c) {
            rtsp_reply_error(c, RTSP_STATUS_BANDWIDTH);
            return;
        }

        /* open input stream */
        if (open_input_stream(rtp_c, "") < 0) {
            rtsp_reply_error(c, RTSP_STATUS_INTERNAL);
            return;
        }
    }

    /* test if stream is OK (test needed because several SETUP needs
     * to be done for a given file) */
    if (rtp_c->stream != stream) {
        rtsp_reply_error(c, RTSP_STATUS_SERVICE);
        return;
    }

    /* test if stream is already set up */
    if (rtp_c->rtp_ctx[stream_index]) {
        rtsp_reply_error(c, RTSP_STATUS_STATE);
        return;
    }

    /* check transport */
    th = find_transport(h, rtp_c->rtp_protocol);
    if (!th || (th->lower_transport == RTSP_LOWER_TRANSPORT_UDP &&
                th->client_port_min <= 0)) {
        rtsp_reply_error(c, RTSP_STATUS_TRANSPORT);
        return;
    }

    /* setup default options */
    setup.transport_option[0] = '\0';
    dest_addr = rtp_c->from_addr;
    dest_addr.sin_port = htons(th->client_port_min);

    /* setup stream */
    if (rtp_new_av_stream(rtp_c, stream_index, &dest_addr, c) < 0) {
        rtsp_reply_error(c, RTSP_STATUS_TRANSPORT);
        return;
    }

    /* now everything is OK, so we can send the connection parameters */
    rtsp_reply_header(c, RTSP_STATUS_OK);
    /* session ID */
    avio_printf(c->pb, "Session: %s\r\n", rtp_c->session_id);

    switch(rtp_c->rtp_protocol) {
    case RTSP_LOWER_TRANSPORT_UDP:
        rtp_port = ff_rtp_get_local_rtp_port(rtp_c->rtp_handles[stream_index]);
        rtcp_port = ff_rtp_get_local_rtcp_port(rtp_c->rtp_handles[stream_index]);
        avio_printf(c->pb, "Transport: RTP/AVP/UDP;unicast;"
                    "client_port=%d-%d;server_port=%d-%d",
                    th->client_port_min, th->client_port_max,
                    rtp_port, rtcp_port);
        break;
    case RTSP_LOWER_TRANSPORT_TCP:
        avio_printf(c->pb, "Transport: RTP/AVP/TCP;interleaved=%d-%d",
                    stream_index * 2, stream_index * 2 + 1);
        break;
    default:
        break;
    }
    if (setup.transport_option[0] != '\0')
        avio_printf(c->pb, ";%s", setup.transport_option);
    avio_printf(c->pb, "\r\n");


    avio_printf(c->pb, "\r\n");
}

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.