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

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Date:	Tue, 7 May 2013 15:21:59 +0200
From:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
To:	Li Zefan <lizefan@...wei.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Marek <mmarek@...e.cz>,
	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

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).

Regards,
Yann E. MORIN.

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