netdev - Re: [PATCH net] packet: fix use after free race in send path when dev is released

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Message-ID: <1384978559.10637.24.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Wed, 20 Nov 2013 12:15:59 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	dborkman@...hat.com, netdev@...r.kernel.org,
	noureddine@...stanetworks.com, greearb@...delatech.com
Subject: Re: [PATCH net] packet: fix use after free race in send path when
 dev is released

On Wed, 2013-11-20 at 15:07 -0500, David Miller wrote:
> From: Daniel Borkmann <dborkman@...hat.com>

> > Yep, will try if this approach works, in other words doing the earlier
> > exit via !po->running, plus deferring the dev_put() et al to RCU.
> 
> Thank you.  You might have to wrap the sendmsg path in an rcu lock
> sequence.

Note that dev_put() / dev_hold() are blazingly fast ;)



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