netdev - Re: [PATCH 1/1] l2tp: fix oops in l2tp_eth

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Message-Id: <20121102.215705.177696570905508047.davem@davemloft.net>
Date:	Fri, 02 Nov 2012 21:57:05 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	tparkin@...alix.com
Cc:	netdev@...r.kernel.org, jchapman@...alix.com
Subject: Re: [PATCH 1/1] l2tp: fix oops in l2tp_eth_create() error path

From: Tom Parkin <tparkin@...alix.com>
Date: Tue, 30 Oct 2012 09:41:48 +0000

> When creating an L2TPv3 Ethernet session, if register_netdev() should fail for
> any reason (for example, automatic naming for "l2tpeth%d" interfaces hits the
> 32k-interface limit), the netdev is freed in the error path.  However, the
> l2tp_eth_sess structure's dev pointer is left uncleared, and this results in
> l2tp_eth_delete() then attempting to unregister the same netdev later in the
> session teardown.  This results in an oops.
> 
> To avoid this, clear the session dev pointer in the error path.
> 
> Signed-off-by: Tom Parkin <tparkin@...alix.com>

Applied, thanks.
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