netdev - Re: [PATCH] macvlan: Fix use after free of struct macvlan

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Date:	Mon, 21 Mar 2011 18:22:32 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	ebiederm@...ssion.com
Cc:	netdev@...r.kernel.org, kaber@...sh.net, greearb@...delatech.com,
	eric.dumazet@...il.com
Subject: Re: [PATCH] macvlan: Fix use after free of struct macvlan_port.

From: ebiederm@...ssion.com (Eric W. Biederman)
Date: Mon, 21 Mar 2011 14:15:31 -0700

> 
> When the macvlan driver was extended to call unregisgter_netdevice_queue
> in 23289a37e2b127dfc4de1313fba15bb4c9f0cd5b, a use after free of struct
> macvlan_port was introduced.  The code in dellink relied on unregister_netdevice
> actually unregistering the net device so it would be safe to free macvlan_port.
> 
> Since unregister_netdevice_queue can just queue up the unregister instead of
> performing the unregiser immediately we free the macvlan_port too soon and
> then the code in macvlan_stop removes the macaddress for the set of macaddress
> to listen for and uses memory that has already been freed.
> 
> To fix this add a reference count to track when it is safe to free the macvlan_port
> and move the call of macvlan_port_destroy into macvlan_uninit which is guaranteed
> to be called after the final macvlan_port_close.
> 
> Signed-off-by: Eric W. Biederman <ebiederm@...stanetworks.com>

Applied, thanks Eric.
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