linux-kernel - Re: [PATCH 5/5] staging/otus: Move a dereference below a NULL test

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Message-ID: <Pine.LNX.4.64.0907112027530.1525@ask.diku.dk>
Date:	Sat, 11 Jul 2009 20:28:11 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Greg KH <gregkh@...e.de>
Cc:	Jiri Slaby <jirislaby@...il.com>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 5/5] staging/otus: Move a dereference below a NULL test

On Sat, 11 Jul 2009, Greg KH wrote:

> On Sat, Jul 11, 2009 at 10:17:24AM +0200, Jiri Slaby wrote:
> > On 07/11/2009 09:51 AM, Julia Lawall wrote:
> > > diff -u -p a/drivers/staging/otus/wwrap.c b/drivers/staging/otus/wwrap.c
> > > --- a/drivers/staging/otus/wwrap.c
> > > +++ b/drivers/staging/otus/wwrap.c
> > > @@ -1016,12 +1016,13 @@ void kevent(struct work_struct *work)
> > >  {
> > >      struct usbdrv_private *macp =
> > >                 container_of(work, struct usbdrv_private, kevent);
> > > -    zdev_t *dev = macp->device;
> > > +    zdev_t *dev;
> > >  
> > >      if (macp == NULL)
> > >      {
> > >          return;
> > >      }
> > 
> > The test is rather useless here.
> 
> Yes it is. 
> 
> Julia, if you just remove the NULL check, will that keep your scripts
> happy from noticing such a "problem"?

Yes.  The trigger is the NULL test after the dereference.

julia
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