linux-kernel - Re: [PATCH] Fix repeatable Oops on container destroy with conntrack

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Date:	Mon, 12 Sep 2011 20:06:25 +0100
From:	Alex Bligh <alex@...x.org.uk>
To:	Pablo Neira Ayuso <pablo@...filter.org>
cc:	Alexey Dobriyan <adobriyan@...il.com>,
	netfilter-devel@...r.kernel.org, netfilter@...r.kernel.org,
	coreteam@...filter.org, linux-kernel@...r.kernel.org,
	containers@...ts.linux-foundation.org,
	Linux Containers <containers@...ts.osdl.org>,
	Alex Bligh <alex@...x.org.uk>
Subject: Re: [PATCH] Fix repeatable Oops on container destroy with conntrack

Pablo,

--On 12 September 2011 20:33:57 +0200 Pablo Neira Ayuso <pablo@...filter.org> wrote:

> Yes, this is what Alexey was pointing out in the previous email and
> why he suggested to move it to nfnetlink_has_listeners (to cover the
> expectation case).
>
> But you're right, we cannot move it to nfnetlink_has_listeners because
> of the item->report case. Please, include the expectation part and
> resend the patch.

Thanks - see below

-- 
Alex Bligh

Signed-off-by: Alex Bligh <alex@...x.org.uk>
---
 net/netfilter/nf_conntrack_netlink.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/net/netfilter/nf_conntrack_netlink.c b/net/netfilter/nf_conntrack_netlink.c
index 482e90c..f44d571 100644
--- a/net/netfilter/nf_conntrack_netlink.c
+++ b/net/netfilter/nf_conntrack_netlink.c
@@ -570,6 +570,11 @@ ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
                return 0;

        net = nf_ct_net(ct);
+
+       /* container deinit, netlink may have died before death_by_timeout */
+       if (!net->nfnl)
+               return 0;
+
        if (!item->report && !nfnetlink_has_listeners(net, group))
                return 0;

@@ -1723,6 +1728,10 @@ ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
        } else
                return 0;

+       /* container deinit, netlink may have died before death_by_timeout */
+       if (!net->nfnl)
+               return 0;
+
        if (!item->report && !nfnetlink_has_listeners(net, group))
                return 0;

-- 
1.7.5.4
--
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