netdev - Re: [Bug 47021] New: kernel panic with l2tpv3 & mtu

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Date:	Wed, 05 Sep 2012 09:45:40 +0200
From:	a1 <a1bert@...as.cz>
To:	Stephen Hemminger <shemminger@...tta.com>
CC:	Eric Dumazet <eric.dumazet@...il.com>, netdev@...r.kernel.org
Subject: Re: [Bug 47021] New: kernel panic with l2tpv3 & mtu > 1500

Thanks, it definitely helped, no more panics now...

jn

>>>
>>
>> Seems following patch is needed, not sure if it helps
>>
>> [PATCH] l2tp: fix a typo in l2tp_eth_dev_recv()
>>
>> While investigating l2tp bug, I hit a bug in eth_type_trans(),
>> because not enough bytes were pulled in skb head.
>>
>> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
>> ---
>>  net/l2tp/l2tp_eth.c |    2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/net/l2tp/l2tp_eth.c b/net/l2tp/l2tp_eth.c
>> index f9ee74d..3bfb34a 100644
>> --- a/net/l2tp/l2tp_eth.c
>> +++ b/net/l2tp/l2tp_eth.c
>> @@ -153,7 +153,7 @@ static void l2tp_eth_dev_recv(struct l2tp_session *session, struct sk_buff *skb,
>>  		print_hex_dump_bytes("", DUMP_PREFIX_OFFSET, skb->data, length);
>>  	}
>>  
>> -	if (!pskb_may_pull(skb, sizeof(ETH_HLEN)))
>> +	if (!pskb_may_pull(skb, ETH_HLEN))
>>  		goto error;
> 
> I guess nobody ever looked inside this code. That seems like an obvious bug.
> 
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