netdev - Re: [BUG] net_cls: Panic occured when net

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Date:	Sun, 31 May 2009 19:40:16 -0400
From:	jamal <hadi@...erus.ca>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Minoru Usui <usui@....nes.nec.co.jp>, netdev@...r.kernel.org,
	containers@...ts.linux-foundation.org
Subject: Re: [BUG] net_cls: Panic occured when net_cls subsystem use

On Sun, 2009-05-31 at 21:55 +0200, Jarek Poplawski wrote:

> But then, there could be "tc filter replace" with only this
> (n->nlmsg_type == RTM_NEWTFILTER && (n->nlmsg_flags&(NLM_F_CREATE)))
> which can't get here with a newly created tp, I guess.

Right - because in that case tp would already exist and would
be found in the lookup.

> I'm almost sure these commands (right or wrong) can trigger such a 
> leak:
> 
> $ sudo tc qdisc add dev lo root handle 1: htb
> $ sudo tc filter add dev lo proto ip pref 1 handle 800::1 u32 match
u32 0 0 classid 1:1
> $ sudo tc filter add dev lo proto ip pref 2 handle 800::1 u32 match
u32 0 0 classid 1:1
> RTNETLINK answers: File exists

You are good - A tip of my hat and a wag of my finger at you;->
Ok, now i looked a lot closer at all 8 classifiers
and u32 is the only one that can fault. It just needs to be fixed.
I will wait until Minoru's patch and then i will submit a fix for it.
Of course the commands from user space are a little rude ;->

cheers,
jamal

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