linux-kernel - Re: [PATCH 1/6] arch/ia64/kernel: remove null pointer dereference

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Date:	Mon, 12 May 2008 16:37:46 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	Simon Holm Thøgersen <odie@...aau.dk>
Cc:	tony.luck@...el.com, linux-ia64@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 1/6] arch/ia64/kernel: remove null pointer dereference

On Mon, 12 May 2008, Simon Holm Thøgersen wrote:

> man, 12 05 2008 kl. 15:37 +0200, skrev Julia Lawall:
> > From: Julia Lawall <julia@...u.dk>
> > 
> > If data is NULL, it is not possible to access data->ret.
> > 
> > The problem was detected using the following semantic match
> > (http://www.emn.fr/x-info/coccinelle/)
> > 
> > // <smpl>
> > @@
> > expression E, E1;
> > identifier f;
> > statement S1,S2,S3;
> > @@
> > 
> > * if (E == NULL)
> > {
> >   ... when != if (E == NULL) S1 else S2
> >       when != E = E1
> > * E->f
> >   ... when any
> >   return ...;
> > }
> > else S3
> > // </smpl>
> > 
> > Signed-off-by: Julia Lawall <julia@...u.dk>
> > 
> > ---
> > 
> > diff -u -p a/arch/ia64/kernel/palinfo.c b/arch/ia64/kernel/palinfo.c
> > --- a/arch/ia64/kernel/palinfo.c	2008-05-09 16:46:57.000000000 +0200
> > +++ b/arch/ia64/kernel/palinfo.c	2008-05-12 08:43:35.000000000 +0200
> > @@ -902,7 +902,6 @@ palinfo_smp_call(void *info)
> >  	palinfo_smp_data_t *data = (palinfo_smp_data_t *)info;
> >  	if (data == NULL) {
> >  		printk(KERN_ERR "palinfo: data pointer is NULL\n");
> > -		data->ret = 0; /* no output */
> >  		return;
> >  	}
> >  	/* does this actual call */
> > --
> 
> The whole if block should just be deleted, as info is never NULL. There
> is only palinfo_handle_smp as (indirect) user of palinfo_smp_call (by
> way of smp_call_function_single) and surely palinfo_smp_call never pass
> NULL.

OK.  Will you fix it?

julia