linux-kernel - Re: [RESEND PATCH] pinctrl: at91: fix null pointer dereference

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Date:	Tue, 28 Jul 2015 15:12:53 +0200
From:	Ludovic Desroches <ludovic.desroches@...el.com>
To:	Linus Walleij <linus.walleij@...aro.org>
CC:	Ludovic Desroches <ludovic.desroches@...el.com>,
	"linux-gpio@...r.kernel.org" <linux-gpio@...r.kernel.org>,
	Jean-Christophe PLAGNIOL-VILLARD <plagnioj@...osoft.com>,
	<davidcdueck@...glemail.com>,
	Alexandre Belloni <alexandre.belloni@...e-electrons.com>,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	Boris Brezillon <boris.brezillon@...e-electrons.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND PATCH] pinctrl: at91: fix null pointer dereference

On Tue, Jul 28, 2015 at 02:48:09PM +0200, Linus Walleij wrote:
> On Tue, Jul 28, 2015 at 9:48 AM, Ludovic Desroches
> <ludovic.desroches@...el.com> wrote:
> 
> > From: David Dueck <davidcdueck@...glemail.com>
> >
> > Not all gpio banks are necessarily enabled, in the current code this can
> > lead to null pointer dereferences.
> >
> > [   51.130000] Unable to handle kernel NULL pointer dereference at virtual address 00000058
> (...)
> >
> > Signed-off-by: David Dueck <davidcdueck@...glemail.com>
> > Acked-by: Ludovic Desroches <ludovic.desroches@...el.com>
> > Acked-by: Alexandre Belloni <alexandre.belloni@...e-electrons.com>
> > CC: Nicolas Ferre <nicolas.ferre@...el.com>
> > CC: Boris Brezillon <boris.brezillon@...e-electrons.com>
> > CC: linux-arm-kernel@...ts.infradead.org
> > CC: linux-kernel@...r.kernel.org
> > ---
> >
> > This patch fixes a oops in the kernel because of a NULL pointer in a table.
> > Having a NULL pointer in this table is the normal behavior if a PIO controller
> > is not enabled. So this fix is not a quick and dirty hack, it's usual to skip
> > an entry from a table if it is not filled.
> 
> Fair enough, better too many checks than too few.
> 
> Is this a regression to v4.2 that should go to stable or v4.3 material?

Yes it is a regression from v4.0, it applies well on v4.0.9

Fixes: a0b957f306fa ("pinctrl: at91: allow to have disabled gpio bank")
Cc: stable@...r.kernel.org # 4.0

Thanks

Ludovic
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