File: ftest2.c

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#include <stdio.h>
#include <stdlib.h>

main()
{
  char *a,*b;

  a=malloc(1024);
  b=malloc(1024);
  b=0;              /* lose reference to b */
  a[-1]='\0';       /* corrupt head of a */
  a[1024]='\0';     /* corrupt tail of a */
  free(a);   
  a[0]=0;           /* store to free'd memory */
  a[1]=0;           /* store to middle of free'd memory */

  b=malloc(1024);   
  free(b);
}