linux-kernel - Re: [PATCH] gpio: mpc8xxx: Prevent NULL pointer deref in demux handler

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Date:	Fri, 18 May 2012 16:40:29 -0600
From:	Grant Likely <grant.likely@...retlab.ca>
To:	Thomas Gleixner <tglx@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>
Cc:	Felix Radensky <felix@...edded-sol.com>,
	Thomas Wucher <thwucher@...utronix.de>,
	Kumar Gala <galak@...nel.crashing.org>
Subject: Re: [PATCH] gpio: mpc8xxx: Prevent NULL pointer deref in demux handler

On Thu, 3 May 2012 12:22:06 +0200 (CEST), Thomas Gleixner <tglx@...utronix.de> wrote:
> This time with the correct CC of the reporter :)

Applied, thanks.

g.

> 
> -------------->
> Subject: gpio: mpc8xxx: Prevent NULL pointer deref in demux handler
> From: Thomas Gleixner <tglx@...utronix.de>
> Date: Thu, 03 May 2012 11:58:09 +0200
> 
> commit cfadd838(powerpc/8xxx: Fix interrupt handling in MPC8xxx GPIO
> driver) added an unconditional call of chip->irq_eoi() to the demux
> handler.
> 
> This leads to a NULL pointer derefernce on MPC512x platforms which use
> this driver as well.
> 
> Make it conditional.
> 
> Reported-by: Thomas Wucher <thwucher@...utronix.de>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Felix Radensky <felix@...edded-sol.com>
> Cc: Kumar Gala <galak@...nel.crashing.org>
> Cc: Grant Likely <grant.likely@...retlab.ca>
> Cc: stable@...r.kernel.org
> ---
>  drivers/gpio/gpio-mpc8xxx.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6/drivers/gpio/gpio-mpc8xxx.c
> ===================================================================
> --- linux-2.6.orig/drivers/gpio/gpio-mpc8xxx.c
> +++ linux-2.6/drivers/gpio/gpio-mpc8xxx.c
> @@ -163,7 +163,8 @@ static void mpc8xxx_gpio_irq_cascade(uns
>  	if (mask)
>  		generic_handle_irq(irq_linear_revmap(mpc8xxx_gc->irq,
>  						     32 - ffs(mask)));
> -	chip->irq_eoi(&desc->irq_data);
> +	if (chip->irq_eoi)
> +		chip->irq_eoi(&desc->irq_data);
>  }
>  
>  static void mpc8xxx_irq_unmask(struct irq_data *d)

-- 
Grant Likely, B.Sc, P.Eng.
Secret Lab Technologies, Ltd.
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