netdev - Re: [PATCH] net: fec: fix potential use after free

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Message-ID: <1387483439.19078.372.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Thu, 19 Dec 2013 12:03:59 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Richard Cochran <richardcochran@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	netdev <netdev@...r.kernel.org>,
	Frank Li <Frank.Li@...escale.com>
Subject: Re: [PATCH] net: fec: fix potential use after free

On Thu, 2013-12-19 at 20:32 +0100, Richard Cochran wrote:
> On Thu, Dec 19, 2013 at 10:53:02AM -0800, Eric Dumazet wrote:
> > From: Eric Dumazet <edumazet@...gle.com>
> > 
> > skb_tx_timestamp(skb) should be called _before_ TX completion
> > has a chance to trigger, otherwise it is too late and we access
> > freed memory.
> > 
> > Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> > Fixes: de5fb0a05348 ("net: fec: put tx to napi poll function to fix dead lock")
> 
> So the hw_lock spin lock was protecting against this issue?
> 
> Nice catch. How ever did you find this?

While looking at another driver, founding the same issue.



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