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

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Message-ID: <20070521143022.GA26452@kernel.sg>
Date:	Mon, 21 May 2007 22:30:22 +0800
From:	Eugene Teo <eugeneteo@...nel.sg>
To:	"John W. Linville" <linville@...driver.com>
Cc:	linux-wireless@...r.kernel.org, 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

<quote sender="John W. Linville">
> On Sat, May 19, 2007 at 11:14:10AM +0800, Eugene Teo wrote:
> > John W. Linville wrote:
> 
> > >>  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).
> 
> OK, I see that.  Looks like Florin has reposted his patch, still
> without this hunk.  Would you like to submit a patch for this hunk?

skb could have been freed by then. Also, in libertas_upload_rx_packet(),
skb->protocol is initialized by eth_type_trans().

Cc: John W. Linville <linville@...driver.com>
Signed-off-by: Eugene Teo <eugeneteo@...nel.sg>
---

diff -uprN -X 2.6.22-rc2/Documentation/dontdiff 2.6.22-rc2.default/drivers/net/wireless/libertas/rx.c 2.6.22-rc2/drivers/net/wireless/libertas/rx.c
--- 2.6.22-rc2.default/drivers/net/wireless/libertas/rx.c	2007-05-21 22:07:50.000000000 +0800
+++ 2.6.22-rc2/drivers/net/wireless/libertas/rx.c	2007-05-21 22:08:44.000000000 +0800
@@ -453,7 +453,5 @@ static int process_rxed_802_11_packet(wl
 done:
 	LEAVE();
 
-	skb->protocol = __constant_htons(0x0019);	/* ETH_P_80211_RAW */
-
 	return (ret);
 }

-- 
1024D/58DF8823 print 47B9 90F6 AE4A 9C51 37E0  D6E1 EA84 C6A2 58DF 8823
main(i) { putchar(182623909 >> (i-1) * 5&31|!!(i<7)<<6) && main(++i); }
-
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