netdev - Re: [PATCH net 0/2] NULL pointer dereference in {ipvlan|macvlan}_port

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Date:   Fri, 03 Nov 2017 14:05:11 +0900 (KST)
From:   David Miller <davem@...emloft.net>
To:     girish.moodalbail@...cle.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net 0/2] NULL pointer dereference in
 {ipvlan|macvlan}_port_destroy

From: Girish Moodalbail <girish.moodalbail@...cle.com>
Date: Tue, 31 Oct 2017 09:39:45 -0700

> When call to register_netdevice() (called from ipvlan_link_new())
> fails, inside that function we call ipvlan_uninit() (through
> ndo_uninit()) to destroy the ipvlan port. Upon returning
> unsuccessfully from register_netdevice() we go ahead and call
> ipvlan_port_destroy() again which causes NULL pointer dereference
> panic.

The problem is that ipvlan doesn't follow the proper convention that
->ndo_uninit() must only release resources allocated by ->ndo_init().

What needs to happen is that the port allocation occur in
->ndo_init().

Your fix, while solving some cases, does not fully cover all of the
posibiities due to this bug.

Please fix this correctly by moving the port allocation and related
setup from link creation to ->ndo_init().

Thank you.