netdev - Re: [PATCH] SMC911X: Fix using of dereferenced skb after netif

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Message-ID: <4755B07A.7060508@pobox.com>
Date:	Tue, 04 Dec 2007 14:54:34 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Wang Chen <wangchen@...fujitsu.com>
CC:	Peter Korsgaard <jacmet@...site.dk>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Dustin McIntire <dustin@...soria.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH] SMC911X: Fix using of dereferenced skb after netif_rx

Wang Chen wrote:
> Peter Korsgaard said the following on 2007-12-3 21:47:
>>>>>>> "Wang" == Wang Chen <wangchen@...fujitsu.com> writes:
>> Hi,
>>
>>  Wang> +	len = skb->len;
>>  Wang>  	netif_rx(skb);
>>  dev-> stats.rx_packets++;
>>  Wang> -	dev->stats.rx_bytes += skb->len;
>>  Wang> +	dev->stats.rx_bytes += len;
>>
>> Why not simply update the stats before calling netif_rx as the return
>> value isn't checked anyway?
>>
> 
> Even the return value of netif_rx isn't checked, dev->stats maybe
> changed in netif_rx. But fortunately dev->stats isn't changed in
> netif_rx.
> So, I agree. 
> Here is the new patch.
> 
> Signed-off-by: Wang Chen <wangchen@...fujitsu.com>
> ---
>  smc911x.c |    2 +-
>  1 files changed, 1 insertion(+), 1 deletion(-)
> 
> --- linux-2.6.24.rc3.org/drivers/net/smc911x.c	2007-11-19 12:38:05.000000000 +0800
> +++ linux-2.6.24.rc3/drivers/net/smc911x.c	2007-12-04 09:59:06.000000000 +0800
> @@ -1299,9 +1299,9 @@ smc911x_rx_dma_irq(int dma, void *data)
>  	PRINT_PKT(skb->data, skb->len);
>  	dev->last_rx = jiffies;
>  	skb->protocol = eth_type_trans(skb, dev);
> -	netif_rx(skb);
>  	dev->stats.rx_packets++;
>  	dev->stats.rx_bytes += skb->len;
> +	netif_rx(skb);
>  

applied #upstream-fixes


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