linux-kernel - Re: Kconfig: conf segfault (with invalid kconfig contents)

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Message-ID: <20071025213225.GB15292@uranus.ravnborg.org>
Date:	Thu, 25 Oct 2007 23:32:25 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	Olof Johansson <olof@...om.net>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Kconfig: conf segfault (with invalid kconfig contents)

Hi Olof.

On Tue, Oct 23, 2007 at 10:14:01PM -0500, Olof Johansson wrote:
> Hi,
> 
> Sorry, no patch, just a bugreport. :)
> 
> I did a mistake in some Kconfig changes (locally) and got a segfault
> from conf:
> 
> #0  0x10005fe0 in sym_check_deps ()
> #1  0x10005f40 in sym_check_expr_deps ()
> #2  0x1000605c in sym_check_deps ()
> #3  0x1000f3f4 in conf_parse ()
> #4  0x10003824 in main ()
> 
> 
> The way to reproduce is simple. I just added the equivalent of this
> to arch/powerpc/Kconfig:
> 
> ---
> config TEST1
>         bool
>         depends on TEST2 && PCI
>         select TEST2
> 
> config TEST2
>         bool
> ---
> 
> Neither TEST1 nor TEST2 exists in the existing .config when I run make
> oldconfig to reproduce.
> 
> It's clearly invalid in that it depends on what it selects, but it should
> just abort instead.

Thanks for the report and especially for the testcase!
I will try to look at it a bit later if noone bites me (I'm afraid not). 

	Sam
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