From: Patrick McHardy Date: Mon, 21 Jan 2008 01:25:14 +0000 (-0800) Subject: [NET]: rtnl_link: fix use-after-free X-Git-Tag: v2.6.24~26^2~3 X-Git-Url: http://pilppa.com/gitweb/?a=commitdiff_plain;h=68365458a4252fa993b91a00f7a0b18fed399f0d;p=linux-2.6-omap-h63xx.git [NET]: rtnl_link: fix use-after-free When unregistering the rtnl_link_ops, all existing devices using the ops are destroyed. With nested devices this may lead to a use-after-free despite the use of for_each_netdev_safe() in case the upper device is next in the device list and is destroyed by the NETDEV_UNREGISTER notifier. The easy fix is to restart scanning the device list after removing a device. Alternatively we could add new devices to the front of the list to avoid having dependant devices follow the device they depend on. A third option would be to only restart scanning if dev->iflink of the next device matches dev->ifindex of the current one. For now this seems like the safest solution. With this patch, the veth rtnl_link_ops unregistration can use rtnl_link_unregister() directly since it now also handles destruction of multiple devices at once. Signed-off-by: Patrick McHardy Signed-off-by: David S. Miller --- diff --git a/drivers/net/veth.c b/drivers/net/veth.c index 43af9e9b265..3f67a29593b 100644 --- a/drivers/net/veth.c +++ b/drivers/net/veth.c @@ -459,19 +459,7 @@ static __init int veth_init(void) static __exit void veth_exit(void) { - struct veth_priv *priv, *next; - - rtnl_lock(); - /* - * cannot trust __rtnl_link_unregister() to unregister all - * devices, as each ->dellink call will remove two devices - * from the list at once. - */ - list_for_each_entry_safe(priv, next, &veth_list, list) - veth_dellink(priv->dev); - - __rtnl_link_unregister(&veth_link_ops); - rtnl_unlock(); + rtnl_link_unregister(&veth_link_ops); } module_init(veth_init); diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c index e1ba26fb4bf..fed95a323b2 100644 --- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -308,9 +308,12 @@ void __rtnl_link_unregister(struct rtnl_link_ops *ops) struct net *net; for_each_net(net) { +restart: for_each_netdev_safe(net, dev, n) { - if (dev->rtnl_link_ops == ops) + if (dev->rtnl_link_ops == ops) { ops->dellink(dev); + goto restart; + } } } list_del(&ops->list);