[LTP] [PATCH v2 2/2] syscalls/fanotify21: add new test checking the returned pidfd from fanotify in FAN_REPORT_PIDFD mode

[Matthew Bobrowski]

On Fri, Nov 05, 2021 at 06:21:56AM +0200, Amir Goldstein wrote:
> > +next_event:
> > +               i += event->event_len;
> > +               if (event->fd >= 0)
> > +                       SAFE_CLOSE(event->fd);
> > +
> > +               if (info && info->pidfd >= 0)
> > +                       SAFE_CLOSE(info->pidfd);
> > +
> > +               if (event_pidfd_fdinfo)
> > +                       free(event_pidfd_fdinfo);
> 
> Need to reset event_pidfd_fdinfo = NULL
> to avoid double free in do_cleanup

But, the variable event_pidfd_fdinfo is not referenced nor is visible
outside the scope of the do_test() function and therefore no double
free would occur, right?

> > +       }
> > +}
> > +
> > +static void do_cleanup(void)
> > +{
> > +       if (fanotify_fd >= 0)
> > +               SAFE_CLOSE(fanotify_fd);
> > +
> > +       if (self_pidfd_fdinfo)
> > +               free(self_pidfd_fdinfo);

Variables self_pidfd_fdinfo do_cleanup() and event_pidfd_fdinfo
do_test() are different.

/M