linux-kernel - Re: [PATCH] irq: fix possible null-pointer deref irq_domain_to

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Date:	Wed, 23 Nov 2011 12:23:08 +0000
From:	Jamie Iles <jamie@...ieiles.com>
To:	Rob Herring <robherring2@...il.com>
Cc:	Jamie Iles <jamie@...ieiles.com>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	Grant Likely <grant.likely@...retlab.ca>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>
Subject: Re: [PATCH] irq: fix possible null-pointer deref irq_domain_to_irq

Hi Rob,

On Thu, Nov 10, 2011 at 07:37:32AM -0600, Rob Herring wrote:
> On 11/10/2011 05:14 AM, Jamie Iles wrote:
> > On Thu, Nov 10, 2011 at 10:53:03AM +0000, Jamie Iles wrote:
> >> It is optional for an irqdomain to have a to_irq() method, and for
> >> simple domains they often don't require any operations at all - just
> >> hwirq to Linux irq translation.  Check we have valid ops before
> >> dereferencing them.
> >>
> >> Patch originally by Rob Herring.
> >>
> >> Suggested-by: Rob Herring <robherring2@...il.com>
> > 
> > Naturally git send-email doesn't know how to convert this into a CC, so 
> > Rob is now CC'd!
> > 
> > Jamie
> > 
> >> Cc: Thomas Gleixner <tglx@...utronix.de>
> >> Cc: Grant Likely <grant.likely@...retlab.ca>
> >> Signed-off-by: Jamie Iles <jamie@...ieiles.com>
> >> ---
> >>
> >> Rob, I can't see that you've already posted this but I didn't want to
> >> hold Marc's GIC patches up.
> 
> Thanks. I didn't get around to it yesterday.
> 
> Acked-by: Rob Herring <rob.herring@...xeda.com>

I've just noticed in kernel/irq/irqdomain.c, that the kerneldoc for 
irq_domain_add() says that a valid ops structure is required, so perhaps 
this fix isn't right and we should just have an empty ops structure for 
simple controllers...

Jamie
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