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

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Date:	Sat, 30 Nov 2013 13:52:05 +0400
From:	Alexander Shiyan <shc_work@...l.ru>
To:	Michael Grzeschik <mgr@...gutronix.de>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>,
	linux-kernel@...r.kernel.org,
	Sascha Hauer <kernel@...gutronix.de>,
	Shawn Guo <shawn.guo@...aro.org>,
	Lee Jones <lee.jones@...aro.org>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RESEND] mfd: mc13xxx: Fix null pointer dereference in mc13xxx_common_init

> 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.

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