Name: yyC67448 Date: 11/11/97



The java.net.DatagramPacket.setData(byte[] ibuf) does not check if the
length of new buffer is greater than or equal to DatagramPacket.length.

JDK is missing documentation for this method.


Here is the test demonstrating the bug:

-------------------------------- Test.java -----------------------------
import java.net.*;


class test
{

  public static void main(String args[])
  {
    DatagramPacket pac = null;
    byte[] ar = new byte[10];
    byte[] array = new byte[200];
    
    array[0] = 22;
    array[array.length -1] = 33;
    
    try {
      pac = new DatagramPacket(ar, ar.length);
    } catch(Exception e)
    {
      System.out.println("Failed. Can not create DatagramPacket:" + e);
      System.exit(-1);
    }
    
    try {
      pac.setData(array);
    } catch(Exception e)
    {
      System.out.println("Failed. Unexpected exception:" + e);
      System.exit(-1);
    }
    
    if(pac.getLength() != array.length)
    {
      System.out.println("Failed. Buffer length mismatch");
      System.exit(-1);
    }
    
    if(pac.getData()[0] == 22 && pac.getData()[pac.getData().length] == 33)
    {
      System.out.println("Passed. OKAY");
      System.exit(0);
    }
    else
    {
      System.out.println("Failed. Data mismatch.");
      System.exit(-1);
    }
    

  }

}

---------------------- Output from the test -----------------
Failed. Buffer length mismatch
-----------------------------------------------------------------
======================================================================