linux-kernel - Re: [PATCH] menuconfig: fix NULL pointer dereference when searching a symbol

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Date:	Tue, 7 May 2013 16:06:39 +0200
From:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
To:	Michal Marek <mmarek@...e.cz>
Cc:	Li Zefan <lizefan@...wei.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Weng Meiling <wengmeiling.weng@...wei.com>,
	Libo Chen <clbchenlibo.chen@...wei.com>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-kbuild@...r.kernel.org, Borislav Petkov <bp@...en8.de>
Subject: Re: [PATCH] menuconfig: fix NULL pointer dereference when searching
 a symbol

Michal, All,

On Tue, May 07, 2013 at 03:47:18PM +0200, Michal Marek wrote:
> On 7.5.2013 15:21, Yann E. MORIN wrote:
> > Li, All,
> > 
> > On Tue, May 07, 2013 at 10:40:59AM +0800, Li Zefan wrote:
> >> Searching PPC_EFIKA results segmentation fault, and it's because
> >> get_symbol_prop() returns NULL.
> >>
> >> In this case CONFIG_PPC_EFIKA is defined in arch/powerpc/platforms/
> >> 52xx/Kconfig, so it won't be parsed if ARCH!=PPC, but menuconfig
> >> knows this symbol when it parses sound/soc/fsl/Kconfig:
> >>
> >> config SND_MPC52xx_SOC_EFIKA
> >>         tristate "SoC AC97 Audio support for bbplan Efika and STAC9766"
> >>         depends on PPC_EFIKA
> >>
> >> This bug was introduced by commit bcdedcc1afd6 ("menuconfig: print more
> >> info for symbol without prompts").
> >>
> >> Reported-by: Borislav Petkov <bp@...en8.de>
> >> Signed-off-by: Li Zefan <lizefan@...wei.com>
> > 
> > Reviewed-by: "Yann E. MORIN" <yann.morin.1998@...e.fr>
> > 
> > Michal, I'll get this in my tree, and will send a pull-request to you
> > later (I may have a few other smallish fixes shortly).
> 
> It's difficult to apply this to kbuild.git#kconfig, because the bug that
> it is fixing is not there. I will send it to Linus by mail.

Indeed. Thank you.

It's strange that a kconfig-related change did not land in your tree
before getting mainline...

[For the records, it got in via akpm's (Andrew MORTON) branch in
 5f56886 ;-) ]

Regards,
Yann E. MORIN.

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