netdev - Re: ppp/l2tp doing oversized allocations ?

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Message-ID: <1337408730.7029.69.camel@edumazet-glaptop>
Date:	Sat, 19 May 2012 08:25:30 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	davej@...hat.com, netdev@...r.kernel.org,
	kernel-team@...oraproject.org, edumazet@...gle.com
Subject: Re: ppp/l2tp doing oversized allocations ?

On Sat, 2012-05-19 at 07:01 +0200, Eric Dumazet wrote:
> On Sat, 2012-05-19 at 00:46 -0400, David Miller wrote:
> 
> > So it's ESP encapsulated IPSEC over L2tp.
> > 
> > Eric, I wonder if session->hdr_len can take on undesirable values and
> > thus trip up the skb COW'ing calculations you added?
> 
> I take a look, thanks
> 

hdr_len is u16, I have no idea how we can reach MAX_ORDER page
allocations... (more than 2 Mbytes...)

Maybe a memory corruption, or a signed/unsigned mismatch.



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