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

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Message-ID: <b10243b50905301522t42aafaffxbf5934388af3df93@mail.gmail.com>
Date:	Sun, 31 May 2009 07:22:37 +0900
From:	Minoru Usui <mi.usui@...il.com>
To:	hadi@...erus.ca
Cc:	Jarek Poplawski <jarkao2@...il.com>,
	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

Hi, jamal

2009/5/30 jamal <hadi@...erus.ca>
>
> On Sat, 2009-05-30 at 14:45 +0200, Jarek Poplawski wrote:
> > On Sat, May 30, 2009 at 08:31:23AM -0400, jamal wrote:
>
> > > Remeber, you could have NLM_F_EXCL|NLM_F_CREATE to indicate "create this
> > > thing if it doesnt exist; if it exists  it is an error"
> > > If it doesnt exist we will enter that (tp == NULL) path
> > > also fh will be 0 ==> So you will never enter the code
> > > path you are refering to.
> > > If it exists (i.e you found it) and you enter the code path you refer
> > > to, then you surely dont want to destroy it if NLM_F_EXCL is set.
> >
> > I mean we don't want to link it again or destroy after ->change() err
> > if we run replace (n->nlmsg_type == RTM_NEWTFILTER &&
> > (n->nlmsg_flags&NLM_F_CREATE)).
>
> excellent point: an additional flag is needed then
> n->nlmsg_flags& (NLM_F_CREATE|NLM_F_EXCL).
> Minoru, please add this change in the patch before testing...

OK.
I'll do it after understanding above code.
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