netdev - Re: [PATCH v3] packet: fix use after free race in send path when dev is released

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Message-ID: <528E8BD6.3060200@candelatech.com>
Date:	Thu, 21 Nov 2013 14:40:22 -0800
From:	Ben Greear <greearb@...delatech.com>
To:	Daniel Borkmann <dborkman@...hat.com>
CC:	davem@...emloft.net, netdev@...r.kernel.org,
	Salam Noureddine <noureddine@...stanetworks.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v3] packet: fix use after free race in send path when
 dev is released

On 11/21/2013 07:50 AM, Daniel Borkmann wrote:
> Salam reported a use after free bug in PF_PACKET that occurs when
> we're sending out frames on a socket bound device and suddenly the
> net device is being unregistered. It appears that commit 827d9780
> introduced a possible race condition between {t,}packet_snd() and
> packet_notifier(). In the case of a bound socket, packet_notifier()
> can drop the last reference to the net_device and {t,}packet_snd()
> might end up suddenly sending a packet over a freed net_device.


Thank you all for finding and fixing this!

Ben

-- 
Ben Greear <greearb@...delatech.com>
Candela Technologies Inc  http://www.candelatech.com

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