linux-kernel - Re: [PATCH 09/12] Fix possible NULL pointer dereference in print_IO

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Message-ID: <alpine.DEB.2.00.1005191520290.11380@kaball-desktop>
Date:	Wed, 19 May 2010 15:25:45 +0100
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
CC:	Stefano Stabellini <Stefano.Stabellini@...citrix.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Don Dutile <ddutile@...hat.com>,
	Sheng Yang <sheng@...ux.intel.com>
Subject: Re: [PATCH 09/12] Fix possible NULL pointer dereference in
 print_IO_APIC

On Tue, 18 May 2010, Jeremy Fitzhardinge wrote:
> On 05/18/2010 03:23 AM, Stefano Stabellini wrote:
> > Make sure chip_data is not NULL before accessing it.
> >   
> 
> You should clarify under what circumstances it can be legitimately NULL.
> 
> 

The VIRQ_TIMER handler and virq handlers in general don't have any
chip_data.


> > Signed-off-by: Stefano Stabellini <stefano.stabellini@...citrix.com>
> > ---
> >  arch/x86/kernel/apic/io_apic.c |    2 ++
> >  1 files changed, 2 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c
> > index eb2789c..c64499c 100644
> > --- a/arch/x86/kernel/apic/io_apic.c
> > +++ b/arch/x86/kernel/apic/io_apic.c
> > @@ -1732,6 +1732,8 @@ __apicdebuginit(void) print_IO_APIC(void)
> >  		struct irq_pin_list *entry;
> >  
> >  		cfg = desc->chip_data;
> > +		if (!cfg)
> > +			continue;
> >  		entry = cfg->irq_2_pin;
> >  		if (!entry)
> >  			continue;
> >   
> 
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