netdev - Re: Re: [PATCH] sfq: add dummy bind/unbind handles

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Date:	Mon, 09 Aug 2010 19:01:17 +0400
From:	Franchoze Eric <franchoze@...dex.ru>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	David Miller <davem@...emloft.net>, shemminger@...tta.com,
	netdev@...r.kernel.org
Subject: Re: Re: [PATCH] sfq: add dummy bind/unbind handles



08.08.10, 11:04, "Jarek Poplawski" <jarkao2@...il.com>:

> David Miller wrote, On 08.08.2010 07:45:
>  
>  > From: Jarek Poplawski 
>  > Date: Sat, 07 Aug 2010 01:17:07 +0200
>  > 
>  >> Stephen Hemminger wrote, On 07.08.2010 00:23:
>  >>
>  >>> Applying a filter to an SFQ qdisc would cause null dereference
>  >>> in tcf_bind_filter because although SFQ is classful it didn't
>  >>> have all the necessary equipment.
>  >>>
>  >>> Better alternative to changing tcf_bind API is to just fix
>  >>> SFQ.  This should go to net-2.6 and stable.
>  >>>
>  >>
>  >> Hmm... FYI, actually I've sent already a similar patch to the
>  >> original bug report thread (except .unbind_tcf method which
>  >> doesn't matter for fixing this bug, so should be rather
>  >> implemented in a separate patch, if needed at all in this
>  >> case).
>  > 
>  > Agreed, I can't see a way that unbind can ever be invoked
>  > if the bind call always returns zero.
>  
>  To tell the truth, I think unbind should be implemented anyway,
>  just for consistency, safety, and easier verification. But, looking
>  at a similar case of .get and .put in the same driver, Patrick
>  seemed to do it purposely, so I expected some discussion about the
>  rules yet, and made it minimal to ease merging to older kernels.
>   
>  Thanks,
>  Jarek P.
>  
>  

As for me it's better to add unbind now that get unexpected null derefance in future with API changing...
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