void reds_on_main_agent_data(MainChannelClient *mcc, void *message, size_t size)
{
    VDIPortState *dev_state = &reds->agent_state;
    VDIChunkHeader *header;
    int res;

    res = agent_msg_filter_process_data(&reds->agent_state.write_filter,
                                        message, size);
    switch (res) {
    case AGENT_MSG_FILTER_OK:
        break;
    case AGENT_MSG_FILTER_DISCARD:
        return;
    case AGENT_MSG_FILTER_MONITORS_CONFIG:
        reds_on_main_agent_monitors_config(mcc, message, size);
        return;
    case AGENT_MSG_FILTER_PROTO_ERROR:
        red_channel_client_shutdown(main_channel_client_get_base(mcc));
        return;
    }

    spice_assert(reds->agent_state.recv_from_client_buf);
    spice_assert(message == reds->agent_state.recv_from_client_buf->buf + sizeof(VDIChunkHeader));
    header =  (VDIChunkHeader *)dev_state->recv_from_client_buf->buf;
    header->port = VDP_CLIENT_PORT;
    header->size = size;
    dev_state->recv_from_client_buf->buf_used = sizeof(VDIChunkHeader) + size;

    dev_state->recv_from_client_buf_pushed = TRUE;
    spice_char_device_write_buffer_add(reds->agent_state.base, dev_state->recv_from_client_buf);
}

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.