linux-kernel - Re: [PATCH] netfilter: nf_conntrack: fix RCU race in nf_conntrack_find

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Message-ID: <CANaxB-zSkmVy+TBCa0CyReiSgubBUmyz6iUp8bxByOr7Jb9oGw@mail.gmail.com>
Date:	Tue, 14 Jan 2014 15:10:50 +0400
From:	Andrey Wagin <avagin@...il.com>
To:	Andrew Vagin <avagin@...allels.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Florian Westphal <fw@...len.de>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>, vvs@...nvz.org,
	Pablo Neira Ayuso <pablo@...filter.org>,
	Patrick McHardy <kaber@...sh.net>,
	Jozsef Kadlecsik <kadlec@...ckhole.kfki.hu>,
	"David S. Miller" <davem@...emloft.net>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: [PATCH] netfilter: nf_conntrack: fix RCU race in
 nf_conntrack_find_get (v3)

>
> Eh, looks like this path is incomplete too:(
>
> I think we can't set a reference counter for objects which is allocated
> from a SLAB_DESTROY_BY_RCU cache. Look at the following backtrace.
>
> cpu1                                    cpu2
> ct = ____nf_conntrack_find()
>                                         destroy_conntrack
> atomic_inc_not_zero(ct)

ct->ct_general.use is zero after destroy_conntrack(). Sorry for the noise.
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