From: Pablo Neira Ayuso <pablo@netfilter.org>
To: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Patrick McHardy <kaber@trash.net>,
netfilter-devel@vger.kernel.org,
Stephen Hemminger <shemminger@vyatta.com>
Subject: Re: [PATCH] netfilter: ctnetlink: fix (really) race condition between dump_table and destroy
Date: Mon, 24 Jan 2011 14:25:41 +0100 [thread overview]
Message-ID: <4D3D7DD5.9020902@netfilter.org> (raw)
In-Reply-To: <1295874722.2755.25.camel@edumazet-laptop>
On 24/01/11 14:12, Eric Dumazet wrote:
> Le lundi 24 janvier 2011 à 14:06 +0100, Pablo Neira Ayuso a écrit :
>
>> Yes, we can use nf_conntrack_get (which does atomic_inc) instead. New
>> patch attached.
>
> I feel now a bit uncomfortable, sorry ;)
>
> Are we sure the refcount cannot reach 0 while we hold
> nf_conntrack_lock ?
the ct deletion from the hash list is protected by spin lock, so
whatever deletion would wait until we have left the dump section.
with this patch, the code looks like it was in 2.6.24 before the rcu stuff.
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next prev parent reply other threads:[~2011-01-24 13:25 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-23 23:16 [PATCH] netfilter: ctnetlink: fix (really) race condition between dump_table and destroy Pablo Neira Ayuso
2011-01-24 6:41 ` Eric Dumazet
2011-01-24 7:04 ` Eric Dumazet
2011-01-24 11:57 ` Pablo Neira Ayuso
2011-01-24 12:46 ` Patrick McHardy
2011-01-24 12:54 ` Eric Dumazet
2011-01-24 13:06 ` Pablo Neira Ayuso
2011-01-24 13:12 ` Eric Dumazet
2011-01-24 13:25 ` Pablo Neira Ayuso [this message]
2011-01-24 13:37 ` Patrick McHardy
2011-01-24 14:06 ` Eric Dumazet
2011-01-24 17:53 ` Patrick McHardy
2011-01-24 18:01 ` Eric Dumazet
2011-01-24 18:16 ` Patrick McHardy
2011-02-20 20:48 ` Stephen Hemminger
2011-02-20 20:51 ` [PATCH 1/2] netfilter: fix race in conntrack " Stephen Hemminger
2011-02-20 20:51 ` [PATCH 2/2] netfilter: ctnetlink: fix missing refcount increment during dumps Stephen Hemminger
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