linux-kernel - Re: [PATCH linux-next 3/4] macvlan: fix possible NULL pointer dereference in macvlan_dev_get

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Date:	Tue, 14 Apr 2015 17:37:57 +0200
From:	Andrew Lunn <andrew@...n.ch>
To:	Nicolas Dichtel <nicolas.dichtel@...nd.com>
Cc:	Patrick McHardy <kaber@...sh.net>, Honggang Li <honli@...hat.com>,
	roland@...nel.org, sean.hefty@...el.com, hal.rosenstock@...il.com,
	davem@...emloft.net, alex.estrin@...el.com, dledford@...hat.com,
	edumazet@...gle.com, erezsh@...lanox.com, maheshb@...gle.com,
	jbenc@...hat.com, ebiederm@...ssion.com,
	elfring@...rs.sourceforge.net, f.fainelli@...il.com,
	linux@...ck-us.net, sfeldma@...il.com, alexander.h.duyck@...el.com,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH linux-next 3/4] macvlan: fix possible NULL pointer
 dereference in macvlan_dev_get_iflink

On Tue, Apr 14, 2015 at 05:35:12PM +0200, Nicolas Dichtel wrote:
> Le 14/04/2015 17:26, Patrick McHardy a écrit :
> >On 14.04, Honggang Li wrote:
> [snip]
> >>-	return vlan->lowerdev->ifindex;
> >>+	if (vlan && vlan->lowerdev)
> >>+		return vlan->lowerdev->ifindex;
> >
> >That is completely useless. vlan (=netdev_priv) can not be NULL as
> >netdev_priv() never returns NULL and vlan->lowerdev is always valid
> >because a macvlan wouldn't make much sense otherwise.
> >
> And I suspect that it is the same for ipvlan and dsa.

I agree about DSA. I don't see any way this could happen.

  Andrew
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