#include <malloc.h>
#include <stdlib.h>

int fun ( void );

int main ( void )
{
  int i;

  i = fun ( );

  return ( 0 );
}

int fun ( void )
{
  int *p = ( int * ) malloc ( 3 * sizeof ( int ) );
  int *pbak = p;

  if ( NULL == p )
  {
    return ( -1 );
  }
  else
  {
    *p = 1;
    p++;
    *p = 2;

    free ( pbak );  //遵循1
    p = NULL;
  }

  return ( 0 );
}