netdev - RE: [B.A.T.M.A.N.] [PATCH net] net: batman-adv: Fix possible memleaks when fail to register

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Date:   Wed, 26 Apr 2017 08:41:30 +0800
From:   "Gao Feng" <gfree.wind@...mail.com>
To:     "'Sven Eckelmann'" <sven@...fation.org>,
        <b.a.t.m.a.n@...ts.open-mesh.org>
Cc:     <mareklindner@...mailbox.ch>, <sw@...onwunderlich.de>,
        <a@...table.cc>, <davem@...emloft.net>, <netdev@...r.kernel.org>,
        "'Gao Feng'" <fgao@...ai8.com>
Subject: RE: [B.A.T.M.A.N.] [PATCH net] net: batman-adv: Fix possible memleaks when fail to register_netdevice

> From: Sven Eckelmann [mailto:sven@...fation.org]
> Sent: Tuesday, April 25, 2017 9:53 PM
> On Dienstag, 25. April 2017 20:03:20 CEST gfree.wind@...mail.com wrote:
> > From: Gao Feng <fgao@...ai8.com>
> >
> > Because the func batadv_softif_init_late allocate some resources and
> > it would be invoked in register_netdevice. So we need to invoke the
> > func batadv_softif_free instead of free_netdev to cleanup when fail to
> > register_netdevice.
> 
> I could be wrong, but shouldn't the destructor be replaced with
free_netdevice
> and the batadv_softif_free (without the free_netdev) used as ndo_uninit?
The
> line you've changed should then be kept as free_netdevice.
> 
> At least this seems to be important when using rtnl_newlink() instead of
the
> legacy sysfs netdev stuff from batman-adv. rtnl_newlink() would also only
call
> free_netdevice and thus also not run batadv_softif_free. This seems to be
only
> fixable by calling ndo_uninit.
> 
> Kind regards,
> 	Sven

Sorry, I don't get you.
The net_dev is created in this func batadv_softif_create.
Why couldn't invoke batadv_softif_free to cleanup when fail to
register_netdevice?

Best Regards
Feng