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Date: Wed, 15 Apr 2015 13:16:40 +0800 From: Honggang LI <honli@...hat.com> To: Erez Shitrit <erezsh@....mellanox.co.il> 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 07:30:03PM +0300, Erez Shitrit wrote: > > @@ -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; > + Hi, Erez Sorry for delay of reply. It was about 01:00 in the morning, so I went into bed. And thank you for the suggestion. You are right. After insert some printk statements in the driver, I confirmed it. ---------------------- console log -------------------- ipoib_get_iflink: priv = ffff880275e487c0, priv->parent = (null), priv->flags = 0x20f, dev = ffff880275e48000, dev->name = qib_ib1 qib_ib1, test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags) = 0 qib_ib1, idev->ifindex = 14 ipoib_get_iflink: priv = ffff8802765d27c0, priv->parent = (null), priv->flags = 0x20f, dev = ffff8802765d2000, dev->name = qib_ib2 qib_ib2, test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags) = 0 qib_ib2, idev->ifindex = 15 ipoib_get_iflink: priv = ffff8804741a47c0, priv->parent = ffff880275e48000, priv->flags = 0x224, dev = ffff8804741a4000, dev->name = qib_ib1.8003 qib_ib1.8003, test_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags) = 1 qib_ib1.8003, idev->ifindex = 16 ---------------------- console log -------------------- I will rewrite the patch. > + /* 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 > > -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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