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

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Message-ID: <20071024031401.GA13376@lixom.net>
Date:	Tue, 23 Oct 2007 22:14:01 -0500
From:	Olof Johansson <olof@...om.net>
To:	sam@...nborg.org
Cc:	linux-kernel@...r.kernel.org
Subject: Kconfig: conf segfault (with invalid kconfig contents)

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.

-Olof
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