linux-kernel - Re: NULL Pointer Deference: NFS & Telnet

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Date:	Fri, 04 Jun 2010 16:15:30 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	x0066660@...com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-omap@...r.kernel.org, tony@...mide.com,
	santosh.shilimkar@...com, Tristram.Ha@...rel.com
Subject: Re: NULL Pointer Deference: NFS & Telnet

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 26 May 2010 22:48:53 +0200

> Le mercredi 26 mai 2010 à 15:19 -0500, Arce, Abraham a écrit :
> 
>> By increasing the allocation length of our rx skbuff the corruption issue is fixed... I have increased it by 2... Were we writing outside our boundaries of skb data?
>> 
>> Please let me know about this approach...
>> 
>> diff --git a/drivers/net/ks8851.c b/drivers/net/ks8851.c
>> index b4fb07a..6da81e1 100644
>> --- a/drivers/net/ks8851.c
>> +++ b/drivers/net/ks8851.c
>> @@ -504,7 +504,7 @@ static void ks8851_rx_pkts(struct ks8851_net *ks)
>>                                ks->rc_rxqcr | RXQCR_SDA | RXQCR_ADRFE);
>> 
>>                 if (rxlen > 0) {
>> -                       skb = netdev_alloc_skb(ks->netdev, rxlen + 2 + 8);
>> +                       skb = netdev_alloc_skb(ks->netdev, rxlen + 4 + 8);
>>                         if (!skb) {
>> 
>> Best Regards
>> Abraham
>> 
> 
> Yes that makes sense, nr_frag is right after the packet (padded to L1
> cache size)
> 
> But please do the correct allocation ?
> 
> Also, we dont need FCS ?

Can we make some progress and get this patch tested and formally
submitted so we can kill this bug?

Thanks!
--
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