netdev - Re: [PATCH 1/9] net classifier: dont allow filters on semi-classful qdisc

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Date:	Sat, 07 Aug 2010 22:59:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jarkao2@...il.com
Cc:	shemminger@...tta.com, netdev@...r.kernel.org
Subject: Re: [PATCH 1/9] net classifier: dont allow filters on
 semi-classful qdisc

From: Jarek Poplawski <jarkao2@...il.com>
Date: Sat, 07 Aug 2010 00:26:17 +0200

> Stephen Hemminger wrote, On 06.08.2010 23:58:
> 
>> On Fri, 06 Aug 2010 23:24:47 +0200
>> Jarek Poplawski <jarkao2@...il.com> wrote:
>> 
>>> Stephen Hemminger wrote, On -10.01.-28163 20:59:
>>>
>>>> There are several qdisc which only support a single class (sfq, mq, tbf)
>>>> and the kernel would dereference a null pointer (bind_tcf), if a user
>>>> attempted to apply a filter one of these classes.
>>>
>>>
>>> mq and tbf can't have this issue because they don't have
>>> .tcf_chain class method. sfq should support it on purpose
>>> after this patch:
>>>
>>> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commitdiff;h=7d2681a6ff4f9ab5e48d02550b4c6338f1638998
>>> and needs tiny fix only.
>> 
>> Probably best to fix both ways.  Fix sfq to allow filters to
>> be chained, and fix API to prevent refuse to allow qdisc to
>> register with tcf_chain && !bind_tcf
>> 
> 
> Yes, but your patch needs a different changelog and I'm not sure
> it's necessary for stable (there should be no other such cases
> for now).

Right.

I'm tossing this series since there are dependencies upon this first
patch for which we've arrived at a different solution (Jarek's
patch).
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