netdev - Re: NULL pointer dereference in xt_register

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Message-ID: <20120906144403.GA11095@1984>
Date:	Thu, 6 Sep 2012 16:44:03 +0200
From:	Pablo Neira Ayuso <pablo@...filter.org>
To:	Cong Wang <xiyou.wangcong@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...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 Thu, Sep 06, 2012 at 10:27:22PM +0800, Cong Wang wrote:
> On Thu, Sep 6, 2012 at 12:48 AM, Pablo Neira Ayuso <pablo@...filter.org> wrote:
> > 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
> >
> 
> Yeah, this indeed fixes the bug.
> 
> Please push it to net-next as soon as possible?

Will do, thanks for testing.
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