linux-kernel - Re: [PATCH] ip_gre: don't overwrite iflink during net

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Message-Id: <20130330.172923.359158542815044103.davem@davemloft.net>
Date:	Sat, 30 Mar 2013 17:29:23 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	ordex@...istici.org
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	fengguang.wu@...el.com, pshelar@...ira.com
Subject: Re: [PATCH] ip_gre: don't overwrite iflink during net_dev init

From: Antonio Quartulli <ordex@...istici.org>
Date: Sat, 30 Mar 2013 18:07:37 +0100

> iflink is currently set to 0 in __gre_tunnel_init(). This
> function is invoked in gre_tap_init() and
> ipgre_tunnel_init() which are both used to initialise the
> ndo_init field of the respective net_device_ops structs
> (ipgre.. and gre_tap..) used by GRE interfaces.
> 
> However, in netdevice_register() iflink is first set to -1,
> then ndo_init is invoked and then iflink is assigned to a
> proper value if and only if it still was -1.
> 
> Assigning 0 to iflink in ndo_init is therefore first
> preventing netdev_register() to correctly assign it a proper
> value and then breaking iflink at all since 0 has not
> correct meaning.
> 
> Fix this by removing the iflink assignment in
> __gre_tunnel_init().
> 
> Introduced by c54419321455631079c7d6e60bc732dd0c5914c5
> ("GRE: Refactor GRE tunneling code.")
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Signed-off-by: Antonio Quartulli <ordex@...istici.org>

Please always indicate, in the subject line inside of the [] brackets,
what tree the patch is targetted at.

I can use "git describe" on the guilty commit, but why take a chance?

Applied to net-next, thanks.
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