netdev - Re: [NET_SCHED]: cls_fw: fix NULL pointer dereference

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Message-Id: <20061205.134637.32347599.davem@davemloft.net>
Date:	Tue, 05 Dec 2006 13:46:37 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	kaber@...sh.net
Cc:	netdev@...r.kernel.org, tgraf@...g.ch, hadi@...erus.ca
Subject: Re: [NET_SCHED]: cls_fw: fix NULL pointer dereference

From: Patrick McHardy <kaber@...sh.net>
Date: Mon, 04 Dec 2006 16:34:46 +0100

> [NET_SCHED]: cls_fw: fix NULL pointer dereference
> 
> When the first fw classifier is initialized, there is a small window
> between the ->init() and ->change() calls, during which the classifier
> is active but not entirely set up and tp->root is still NULL (->init()
> does nothing).
> 
> When a packet is queued during this window a NULL pointer dereference
> occurs in fw_classify() when trying to dereference head->mask;
> 
> Signed-off-by: Patrick McHardy <kaber@...sh.net>

I've applied this, thanks Patrick.
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