linux-kernel - Re: [PATCH linux-next 1/4] infiniband/ipoib: fix possible NULL pointer dereference in ipoib_get

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Date:	Tue, 14 Apr 2015 19:30:03 +0300
From:	Erez Shitrit <erezsh@....mellanox.co.il>
To:	Honggang Li <honli@...hat.com>
Cc:	Roland Dreier <roland@...nel.org>, sean.hefty@...el.com,
	hal.rosenstock@...il.com, kaber@...sh.net, davem@...emloft.net,
	Alex Estrin <alex.estrin@...el.com>,
	Doug Ledford <dledford@...hat.com>, edumazet@...gle.com,
	Erez Shitrit <erezsh@...lanox.com>, nicolas.dichtel@...nd.com,
	maheshb@...gle.com, jbenc@...hat.com, ebiederm@...ssion.com,
	elfring@...rs.sourceforge.net, f.fainelli@...il.com,
	linux@...ck-us.net, andrew@...n.ch, sfeldma@...il.com,
	alexander.h.duyck@...el.com,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH linux-next 1/4] infiniband/ipoib: fix possible NULL
 pointer dereference in ipoib_get_iflink

On Tue, Apr 14, 2015 at 6:20 PM, Honggang Li <honli@...hat.com> wrote:
>

[...]

Hi,

> diff --git a/drivers/infiniband/ulp/ipoib/ipoib_main.c b/drivers/infiniband/ulp/ipoib/ipoib_main.c
> index 657b89b..11ea6e2 100644
> --- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
> +++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
> @@ -846,7 +846,10 @@ static int ipoib_get_iflink(const struct net_device *dev)
>  {
>         struct ipoib_dev_priv *priv = netdev_priv(dev);
>
> -       return priv->parent->ifindex;
> +       if (priv && priv->parent)
> +               return priv->parent->ifindex;
> +       else
> +               return 0;
This will make parent interface to return 0 instead of its own ifindex.
I would suggest write something like that:

+       /* parent interface */
+       if (!test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags))
+               return dev->ifindex;
+
+       /* child/vlan interface */
+       if (!priv->parent)
+               return -1;
+
        return priv->parent->ifindex;

Thanks,
Erez.

>  }
>
>  static u32 ipoib_addr_hash(struct ipoib_neigh_hash *htbl, u8 *daddr)
> --
> 1.8.3.1
>
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