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 09:14:08 +0100
From:	Ian Campbell <Ian.Campbell@...citrix.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	David Miller <davem@...emloft.net>,
	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

On Thu, 2010-08-26 at 09:03 +0100, Eric Dumazet wrote:
> Here is the patch, could you test it please ?
> 
> Thanks !
> 
> [PATCH] l2tp: test for malicious frames in l2tp_eth_dev_recv()
> 
> close https://bugzilla.kernel.org/show_bug.cgi?id=16529
> 
> Before calling dev_forward_skb(), we should make sure skb contains at
> least an ethernet header, even if length included in upper layer said
> so.

Does this imply that there is some problem with xen-netfront setting
skb->len or skb->data_len or something incorrectly? It's not clear where
data_len has come from in this context.

Ian.

> 
> Reported-by: Thomas Heil <heil@...minal-consulting.de>
> Reported-by: Ian Campbell <Ian.Campbell@...citrix.com>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> ---
>  net/l2tp/l2tp_core.c |    2 +-
>  net/l2tp/l2tp_eth.c  |    2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
> index 58c6c4c..0687c5c 100644
> --- a/net/l2tp/l2tp_eth.c
> +++ b/net/l2tp/l2tp_eth.c
> @@ -132,7 +132,7 @@ static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb,
>  		printk("\n");
>  	}
>  
> -	if (data_len < ETH_HLEN)
> +	if (skb->len < ETH_HLEN)
>  		goto error;
>  
>  	secpath_reset(skb);
> 
> 


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