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

[Michal Marek <mmarek@suse.cz>]

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@alien8.de>
>> Signed-off-by: Li Zefan <lizefan@huawei.com>
> 
> Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.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.

Michal