Bug 1645

I built a environment with two wifi nodes and run it with --vis argument
When device send packet smaller than 23 bytes. An "assert failed" occourred:

assert failed. cond="m_current >= m_dataStart && m_current <= m_dataEnd", msg="You have attempted to read beyond the bounds of the available buffer space. This usually indicates that a Header::Deserialize or Trailer::Deserialize method is trying to read data which was not written by a Header::Serialize or Trailer::Serialize method. In short: check the code of your Serialize and Deserialize methods.", file=./ns3/buffer.h, line=823
terminate called without an active exception

Here is the test code:

#include "ns3/core-module.h"
#include "ns3/network-module.h"
#include "ns3/wifi-module.h"
#include "ns3/mobility-module.h"
#include <string>

using namespace ns3;

NS_LOG_COMPONENT_DEFINE ("VisualizerTest");

int main (int argc, char *argv[])
{
  CommandLine cmd;
  cmd.Parse(argc, argv);
	
  NodeContainer nodes;
  nodes.Create (2);

  std::string phyMode("DsssRate1Mbps");
  YansWifiPhyHelper wifiPhy = YansWifiPhyHelper::Default();
  YansWifiChannelHelper wifiChannel = YansWifiChannelHelper::Default();
  NqosWifiMacHelper wifiMac = NqosWifiMacHelper::Default();
	
  wifiPhy.SetChannel(wifiChannel.Create());
	
  WifiHelper wifi;
  wifi.SetStandard(WIFI_PHY_STANDARD_80211a);
  wifi.SetRemoteStationManager("ns3::ConstantRateWifiManager",
    "DataMode", StringValue(phyMode),
    "ControlMode", StringValue(phyMode));
  wifiMac.SetType("ns3::AdhocWifiMac");
	
  NetDeviceContainer devices;
  devices = wifi.Install(wifiPhy, wifiMac, nodes);
  
  MobilityHelper mobility;
    mobility.SetMobilityModel("ns3::ConstantPositionMobilityModel");
    mobility.Install(nodes);

  ns3::PacketMetadata::Enable();
	
  Ptr<Packet> p = Create<Packet>(22); // assert failed
  //Ptr<Packet> p = Create<Packet>(23); // it works
	
  devices.Get(0)->Send(p, Mac48Address::GetBroadcast(), 0x0);
	
  Simulator::Run ();
  Simulator::Destroy ();
  return 0;
}