netdev - Re: [PATCH] libertas: skb dereferenced after netif

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Date:	Sat, 19 May 2007 22:20:14 -0700
From:	Stephen Hemminger <shemminger@...ux-foundation.org>
To:	Jeff Garzik <jeff@...zik.org>
Cc:	Dan Williams <dcbw@...hat.com>,
	"John W. Linville" <linville@...driver.com>,
	Florin Malita <fmalita@...il.com>, marcelo@...ck.org,
	linville@...hat.com, netdev@...r.kernel.org,
	linux-wireless@...r.kernel.org
Subject: Re: [PATCH] libertas: skb dereferenced after netif_rx

On Sat, 19 May 2007 21:47:00 -0400
Jeff Garzik <jeff@...zik.org> wrote:

> Dan Williams wrote:
> > On Fri, 2007-05-18 at 14:09 -0400, John W. Linville wrote:
> >> On Wed, May 16, 2007 at 05:01:27PM -0400, Florin Malita wrote:
> >>> In libertas_process_rxed_packet() and process_rxed_802_11_packet() the 
> >>> skb is dereferenced after being passed to netif_rx (called from 
> >>> libertas_upload_rx_packet). Spotted by Coverity (1658, 1659).
> >>  
> >> Relocating the libertas_upload_rx_packet call is fine, but...
> >>
> >>> Also, libertas_upload_rx_packet() unconditionally returns 0 so the error 
> >>> check is dead code - might as well take it out.
> >> Is this merely an implementation detail?  Or an absolute fact?
> >> If the former is true, then we should preserve the error
> >> checking.  If the latter, then we should change the signature of
> >> libertas_upload_rx_packet to return void.
> > 
> > According to the comments, netif_rx always succeeds.  I think we should
> > just change the return type to void since there's nothing else in that
> > function that can fail.
> 
> According to the implementation, netif_rx() can fail.
> 
> 	Jeff

Yeah, it was the old congestion levels that got dropped.
The skb is always consumed so the the return value is informational only.


-- 
Stephen Hemminger <shemminger@...ux-foundation.org>
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