netdev - Re: + oops-in-drivers-net-shaperc.patch added to -mm tree

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Message-ID: <20070127010146.GA18851@gondor.apana.org.au>
Date:	Sat, 27 Jan 2007 12:01:46 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, deweerdt@...e.fr,
	netdev@...r.kernel.org, frederik.deweerdt@...il.com,
	shemminger@...l.org
Subject: Re: + oops-in-drivers-net-shaperc.patch added to -mm tree

On Sat, Jan 27, 2007 at 11:45:05AM +1100, Herbert Xu wrote:
> David Miller <davem@...emloft.net> wrote:
> > 
> > Shaper is actually OK.  None of these hardware header callbacks
> > should be invoked if the device is down.  Yet, this is what is
> > accidently being allowed in the AF_PACKET socket layer.
> 
> Hmm, what if the device goes down after the check?

In fact, the shaper device doesn't even seem to take a ref count of
the device it has attached to.  So that device can go away at any time.
What's more, there are drivers that can change hard_header at run-time
(s390).

Cheers,
-- 
Visit Openswan at http://www.openswan.org/
Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
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