linux-kernel - Re: [bisected] NULL pointer dereference in acpi_gpiochip

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Date:	Tue, 25 Mar 2014 09:25:30 +0200
From:	Mika Westerberg <mika.westerberg@...ux.intel.com>
To:	Sabrina Dubroca <sd@...asysnail.net>
Cc:	linux-gpio@...r.kernel.org, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [bisected] NULL pointer dereference in acpi_gpiochip_add (on
 modprobe ssb)

On Mon, Mar 24, 2014 at 07:31:11PM +0100, Sabrina Dubroca wrote:
> > Actually gpiolib seems to handle ->dev as optional. Can you try this patch
> > instead? Thanks.
> > 
> > diff --git a/drivers/gpio/gpiolib-acpi.c b/drivers/gpio/gpiolib-acpi.c
> > index bf0f8b476696..642b2bf3360e 100644
> > --- a/drivers/gpio/gpiolib-acpi.c
> > +++ b/drivers/gpio/gpiolib-acpi.c
> > @@ -501,6 +501,9 @@ void acpi_gpiochip_add(struct gpio_chip *chip)
> >  	acpi_handle handle;
> >  	acpi_status status;
> >  
> > +	if (!chip || !chip->dev)
> > +		return;
> > +
> >  	handle = ACPI_HANDLE(chip->dev);
> >  	if (!handle)
> >  		return;
> > @@ -531,6 +534,9 @@ void acpi_gpiochip_remove(struct gpio_chip *chip)
> >  	acpi_handle handle;
> >  	acpi_status status;
> >  
> > +	if (!chip || !chip->dev)
> > +		return;
> > +
> >  	handle = ACPI_HANDLE(chip->dev);
> >  	if (!handle)
> >  		return;
> 
> Thanks, this patch solves the problem.

Great thanks for testing. Can I add your tested-by to the patch?

I'll submit a formal patch for this next week as I'm currently on vacation.
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