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

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Message-ID: <20090529080330.GB5483@ff.dom.local>
Date:	Fri, 29 May 2009 08:03:30 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Minoru Usui <usui@....nes.nec.co.jp>
Cc:	netdev@...r.kernel.org, containers@...ts.linux-foundation.org,
	Jamal Hadi Salim <hadi@...erus.ca>
Subject: Re: [BUG] net_cls: Panic occured when net_cls subsystem use

On Fri, May 29, 2009 at 07:48:12AM +0000, Jarek Poplawski wrote:
> On 29-05-2009 07:18, Minoru Usui wrote:
...
> > I investigated this problem, and I found a bug in tc_ctl_tfilter() in net/sched/cls_api.c.
> > 
> > When 'tc filter add' command is executed and proto-tcf does not exist, 
> > tcf_ctl_tfilter() allocates, initializes and chanins proto-tcf(tp) to
> > cops->tcf_chain()'s chain before calling tp->ops->change().
> > 
> > If tp->ops->change() returns an error, tcf_ctl_tfilter() returns an error
> > too, but proto-tcf(tp) is not unchained yet. 
> > 
> > I think tcf_ctl_tfilter() shouldn't chain proto-tcf to the chain before it returns
> > an error.
> 
> I didn't verify this too much, so I might be wrong, but it looks like
> cls_cgroup_classify() does things a bit different than others (doesn't
> check the 'head' etc. for NULL), so maybe you should consider fixing
> it instead? (Btw., the tc classifier maintainer added to Cc).

OOPS! Others mostly don't check this either, so my suggestion was wrong.

Sorry,
Jarek P.
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