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

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Date:	Mon, 2 Dec 2013 11:17:23 +0000
From:	Lee Jones <lee.jones@...aro.org>
To:	Alexander Shiyan <shc_work@...l.ru>
Cc:	Samuel Ortiz <sameo@...ux.intel.com>, linux-kernel@...r.kernel.org,
	Michael Grzeschik <mgr@...gutronix.de>,
	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 Mon, 02 Dec 2013, Alexander Shiyan wrote:

> 
> 
> 
> Понедельник,  2 декабря 2013, 10:56 UTC от Lee Jones <lee.jones@...aro.org>:
> > 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.
> 
> I still have two incomplete MC13XXX DT-related patches.
> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-June/175099.html
> http://lists.infradead.org/pipermail/linux-arm-kernel/2013-July/182116.html

Patches from June and July are no longer pending. They need to be
refreshed if you stand any chance of then being accepted.

> I'll resume to work on this (and CODEC & TS too).

Okay, thanks.

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