netdev - Re: [PATCH] tcp: skb_shift cannot cache frag ptrs past pskb_expand

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Message-Id: <20081125.135730.24376719.davem@davemloft.net>
Date:	Tue, 25 Nov 2008 13:57:30 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	ilpo.jarvinen@...sinki.fi
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] tcp: skb_shift cannot cache frag ptrs past
 pskb_expand_head

From: "Ilpo Järvinen" <ilpo.jarvinen@...sinki.fi>
Date: Tue, 25 Nov 2008 22:08:06 +0200 (EET)

> Since pskb_expand_head creates copy of the shared area we
> cannot keep any frag ptr past de-cloning. This fixes the
> tcpdump recvfrom -EFAULT problem.
> 
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@...sinki.fi>

Good catch.

I think everyone mucking around with these sorts of things
has made this error at least once or twice :)
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