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

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Date:	Mon, 4 Dec 2006 17:59:22 +0100
From:	Thomas Graf <tgraf@...g.ch>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	jamal <hadi@...erus.ca>, "David S. Miller" <davem@...emloft.net>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [NET_SCHED]: cls_fw: fix NULL pointer dereference

* Patrick McHardy <kaber@...sh.net> 2006-12-04 17:39
> It just seems this code is entirely useless and the only
> thing it does is cause short term unexpected behaviour
> during the race I mentioned.

Yes, the whole head == NULL branch should be removed.

> One thing we should probably do is to move the tp->root
> allocation to the init function in cls_fw and the others
> implementing it as dummy to at least close the race
> between ->init and ->change. I'll look into that as a
> follow-up patch.

Right, allocating the head in init with a mask of 0xFFFFFFFF
and then allow the user to overwrite it seems to make most
sense.
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