linux-kernel - Re: [PATCH RESEND] mfd: mc13xxx: Fix null pointer dereference in mc13xxx_common

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Message-ID: <20131202105650.GD29373@lee--X1>
Date:	Mon, 2 Dec 2013 10:56:50 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Alexander Shiyan <shc_work@...l.ru>
Cc:	Michael Grzeschik <mgr@...gutronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawn.guo@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RESEND] mfd: mc13xxx: Fix null pointer dereference in
 mc13xxx_common_init

On Sat, 30 Nov 2013, Alexander Shiyan wrote:

> > On Sat, Nov 30, 2013 at 08:55:37AM +0400, Alexander Shiyan wrote:
> > > If this driver being loaded from devicetree, the pdata is NULL.
> > > This cause kernel Oops when "fsl,mc13xxx-uses-codec" and/or
> > > "fsl,mc13xxx-uses-touch" properties is specified.
> > > 
> > > mc13xxx spi0.0: mc13783: rev: 3.3, fin: 0, fab: 0, icid: 2/0
> > > Unable to handle kernel NULL pointer dereference at virtual address 00000018
> ...
> > > -	if (mc13xxx->flags & MC13XXX_USE_TOUCHSCREEN)
> > > +	if ((mc13xxx->flags & MC13XXX_USE_CODEC) && pdata)
> > 
> > Why do we check for CODEC if the Touchscreen should be used?
> 
> Oops, my fault, copy/paste bug.
> I'll send the corrected version.

No, please don't.

Just provide proper Device Tree support.

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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