netdev - Re: Data corruption issue with splice() on 2.6.27.10

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Message-ID: <20090107095218.GA24264@gondor.apana.org.au>
Date:	Wed, 7 Jan 2009 20:52:18 +1100
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Willy Tarreau <w@....eu>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Evgeniy Polyakov <zbr@...emap.net>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: Data corruption issue with splice() on 2.6.27.10

On Wed, Jan 07, 2009 at 07:38:59AM +0100, Willy Tarreau wrote:
>
> > Unfortunately, once the pipe is fed into sendpage we only use
> > page reference counting to pin down the memory.  So as soon as
> > sendpage returns we drop the ref count on the skb, thus freeing
> > the memory in skb->head, which is yet to be transmitted.
> 
> So this means that anything relying on sendpage() is at risk ? What

No the bug is in the splice code.  sendfile() and other sendpage
users are not affected.

Cheers,
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Email: Herbert Xu ~{PmV>HI~} <herbert@...dor.apana.org.au>
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