netdev - Re: [Bugme-new] [Bug 16529] New: xennet driver crashes when using with pseudowire aka l2tpv3

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Date:	Thu, 26 Aug 2010 09:22:34 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Ian Campbell <Ian.Campbell@...citrix.com>
Cc:	Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Chris Wright <chrisw@...s-sol.org>,
	"bugzilla-daemon@...zilla.kernel.org" 
	<bugzilla-daemon@...zilla.kernel.org>,
	"bugme-daemon@...zilla.kernel.org" <bugme-daemon@...zilla.kernel.org>,
	James Chapman <jchapman@...alix.com>,
	"heil@...minal-consulting.de" <heil@...minal-consulting.de>,
	"Xen-devel@...ts.xensource.com" <Xen-devel@...ts.xensource.com>
Subject: Re: [Bugme-new] [Bug 16529] New: xennet driver crashes when using
 with pseudowire aka l2tpv3

Le jeudi 26 août 2010 à 08:10 +0100, Ian Campbell a écrit :
> On Wed, 2010-08-25 at 23:56 +0100, Jeremy Fitzhardinge wrote:
> 
> > >> Here is a link for the setup
> > >> http://www.pastebin.org/445975
> > >> and here a link with more details about the crash http://pastebin.org/449221
> > 
> > Please attach these to the bug or something; pastebin is not working for
> > me at the moment.
> 
> It's really slow for me but got there eventually. I've attached the
> files.
> 
> It's apparently hitting this BUG_ON in __skb_pull:
>         
>         static inline unsigned char *__skb_pull(struct sk_buff *skb, unsigned int len)
>         {
>                 skb->len -= len;
>                 BUG_ON(skb->len < skb->data_len);
>                 return skb->data += len;
>         }
> 
> Ian.
> 

Thanks a lot.

I'll submit a patch to fix l2tp_eth_dev_recv() 

Its illegal to call dev_forward_skb() with a too small payload.



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