linux-kernel - Re: [2.6 patch] drivers/net/wireless/libertas/rx.c: fix use-after-free

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Date:	Sat, 19 May 2007 11:14:10 +0800
From:	Eugene Teo <eteo@...hat.com>
To:	linux-wireless@...r.kernel.org
CC:	"John W. Linville" <linville@...driver.com>,
	linux-kernel@...r.kernel.org, jeff@...zik.org,
	Florin Malita <fmalita@...il.com>
Subject: Re: [2.6 patch] drivers/net/wireless/libertas/rx.c: fix use-after-free

John W. Linville wrote:
> First, please send all wireless patches to
> linux-wireless@...r.kernel.org, and be sure to CC me as well...thanks!
> 
> On Sat, May 19, 2007 at 12:50:31AM +0800, Eugene Teo wrote:
>> libertas_upload_rx_packet() calls netif_rx() before returning, and it always return 0.
>> Also within libertas_upload_rx_packet(), it will initialize skb->protocol anyways.
>>
>> Spotted by the Coverity checker.
> 
> A nearly identical patch was posted by Florin Malita <fmalita@...il.com>
> to netdev (also the wrong list) on Wednesday evening.

Nod. I wasn't subscribed to netdev list.

>>  done:
>>         LEAVE();
>>
>> -       skb->protocol = __constant_htons(0x0019);       /* ETH_P_80211_RAW */
>> -
> 
> Except for this part...is this intentional?

skb could have been freed by then. And, in libertas_upload_rx_packet(), skb->protocol
is initialized by eth_type_trans(skb, priv->wlan_dev.netdev).

Eugene

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