netdev - Re: NULL pointer dereference in xt_register

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Message-ID: <20120905164831.GA21836@1984>
Date:	Wed, 5 Sep 2012 18:48:31 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Cong Wang <xiyou.wangcong@...il.com>,
	netfilter-devel@...r.kernel.org,
	Linux Kernel Network Developers <netdev@...r.kernel.org>
Subject: Re: NULL pointer dereference in xt_register_target()

On Wed, Sep 05, 2012 at 05:55:06PM +0200, Eric Dumazet wrote:
> On Wed, 2012-09-05 at 23:43 +0800, Cong Wang wrote:
> > Hi, folks,
> > 
> > The latest net-next tree can't boot due to a NULL ptr def
> > bug in the kernel, the full backtrack is:
> > 
> > http://img1.douban.com/view/photo/photo/public/p1697139550.jpg
> > 
> > the kernel .config file is:
> > 
> > http://pastebin.com/9YTnkqKN
> > 
> > I don't have time to look into the issue. If you need other info,
> > please let me know.
> 
> It seems xt_nat_init() is called before xt_init(), so xt array is not
> yet setup.

I have enqueued the following patch to fix this:

http://1984.lsi.us.es/git/nf-next/commit/?id=00545bec9412d130c77f72a08d6c8b6ad21d4a1
e
commit 00545bec9412d130c77f72a08d6c8b6ad21d4a1e
Author: Pablo Neira Ayuso <pablo@...filter.org>
Date:   Wed Sep 5 18:24:55 2012 +0200

    netfilter: fix crash during boot if NAT has been compiled built-in

Thanks.
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