linux-kernel - Re: [PATCH 3/3] Fix use of skb after netif

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Message-ID: <475CEC2E.4040006@cn.fujitsu.com>
Date:	Mon, 10 Dec 2007 15:35:10 +0800
From:	Wang Chen <wangchen@...fujitsu.com>
To:	Julia Lawall <julia@...u.dk>
CC:	fpavlic@...ibm.com, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org, Jeff Garzik <jgarzik@...ox.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH 3/3] Fix use of skb after netif_rx

Julia Lawall said the following on 2007-12-10 15:18:
>> Julia, seems that your semantic patch misses following place.
>>
>> drivers/s390/net/qeth_main.c:2733
>> ...
>> #endif
>> 			rxrc = netif_rx(skb);
>> 		card->dev->last_rx = jiffies;
>> 		card->stats.rx_packets++;
>> 		card->stats.rx_bytes += skb->len;
>> ...
> 
> Actually, I found this one as well, but I wasn't sure what to do with it.  
> This one is a bit more complicated because the line with the call to 
> netif_rx is in an else branch if the #ifdef above is taken.  So I wasn't 
> sure what would be the best way to solve the problem in this case.
> 
> Perhaps the solution would be just to save the value of the len field 
> in a local variable in this case, as you proposed in your original patch.
> 

I agree.

BTW, please send driver patch to Jeff Garzik <jgarzik@...ox.com> and
cc to netdev@...r.kernel.org.

--
WCN

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