linux-kernel - Re: [PATCH 2.6.20 13/14] nfnetlink

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Date:	Tue, 13 Feb 2007 13:58:34 +0100
From:	Patrick McHardy <kaber@...sh.net>
To:	Michał Mirosław <mirq-linux@...e.qmqm.pl>
CC:	netfilter-devel@...ts.netfilter.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.20 13/14] nfnetlink_log: fix reference counting

Micha³ Miros³aw wrote:
> Fix reference counting (memory leak) problem in __nfulnl_send() and callers
> related to packet queueing.
> 
> Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
> 
> --- linux-2.6.20/net/netfilter/nfnetlink_log.c.11	2007-02-12 17:35:50.000000000 +0100
> +++ linux-2.6.20/net/netfilter/nfnetlink_log.c	2007-02-12 17:58:01.000000000 +0100
> @@ -223,6 +223,11 @@ _instance_destroy2(struct nfulnl_instanc
>  
>  	spin_lock_bh(&inst->lock);
>  	if (inst->skb) {
> +		/* timer "holds" one reference (we have one more) */
> +		if (timer_pending(&inst->timer)) {
> +			del_timer(&inst->timer);
> +			instance_put(inst);

This should be done outside of the locked section and using
del_timer_sync to make sure the timer is not already active
and waiting for the lock.

Please combine this with 07/10 if possible.
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