[NET]: Fix free_netdev on register_netdev failure.

Point 1:
The unregistering of a network device schedule a netdev_run_todo.
This function calls dev->destructor when it is set and the
destructor calls free_netdev.

Point 2:
In the case of an initialization of a network device the usual code
is:
 * alloc_netdev
 * register_netdev
    -> if this one fails, call free_netdev and exit with error.

Point 3:
In the register_netdevice function at the later state, when the device
is at the registered state, a call to the netdevice_notifiers is made.
If one of the notification falls into an error, a rollback to the
registered state is done using unregister_netdevice.

Conclusion:
When a network device fails to register during initialization because
one network subsystem returned an error during a notification call
chain, the network device is freed twice because of fact 1 and fact 2.
The second free_netdev will be done with an invalid pointer.

Proposed solution:
The following patch move all the code of unregister_netdevice *except*
the call to net_set_todo, to a new function "rollback_registered".

The following functions are changed in this way:
 * register_netdevice: calls rollback_registered when a notification fails
 * unregister_netdevice: calls rollback_register + net_set_todo, the call
                         order to net_set_todo is changed because it is the
                         latest now. Since it justs add an element to a list
                         that should not break anything.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/dev.c b/net/core/dev.c
index 02e7d8377c4a2b33abf1cfb9a00d83fad16d26ed..91ece48e127e5195f07a5cfad9ffff478155a7b7 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -3496,6 +3496,60 @@ static void net_set_todo(struct net_device *dev)
        spin_unlock(&net_todo_list_lock);
 }
 
+static void rollback_registered(struct net_device *dev)
+{
+       BUG_ON(dev_boot_phase);
+       ASSERT_RTNL();
+
+       /* Some devices call without registering for initialization unwind. */
+       if (dev->reg_state == NETREG_UNINITIALIZED) {
+               printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
+                                 "was registered\n", dev->name, dev);
+
+               WARN_ON(1);
+               return;
+       }
+
+       BUG_ON(dev->reg_state != NETREG_REGISTERED);
+
+       /* If device is running, close it first. */
+       dev_close(dev);
+
+       /* And unlink it from device chain. */
+       unlist_netdevice(dev);
+
+       dev->reg_state = NETREG_UNREGISTERING;
+
+       synchronize_net();
+
+       /* Shutdown queueing discipline. */
+       dev_shutdown(dev);
+
+
+       /* Notify protocols, that we are about to destroy
+          this device. They should clean all the things.
+       */
+       call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
+
+       /*
+        *      Flush the unicast and multicast chains
+        */
+       dev_addr_discard(dev);
+
+       if (dev->uninit)
+               dev->uninit(dev);
+
+       /* Notifier chain MUST detach us from master device. */
+       BUG_TRAP(!dev->master);
+
+       /* Remove entries from kobject tree */
+       netdev_unregister_kobject(dev);
+
+       synchronize_net();
+
+       dev_put(dev);
+}
+
 /**
  *     register_netdevice      - register a network device
  *     @dev: device to register
@@ -3633,8 +3687,10 @@ int register_netdevice(struct net_device *dev)
        /* Notify protocols, that a new device appeared. */
        ret = call_netdevice_notifiers(NETDEV_REGISTER, dev);
        ret = notifier_to_errno(ret);
-       if (ret)
-               unregister_netdevice(dev);
+       if (ret) {
+               rollback_registered(dev);
+               dev->reg_state = NETREG_UNREGISTERED;
+       }
 
 out:
        return ret;
@@ -3911,59 +3967,9 @@ void synchronize_net(void)
 
 void unregister_netdevice(struct net_device *dev)
 {
-       BUG_ON(dev_boot_phase);
-       ASSERT_RTNL();
-
-       /* Some devices call without registering for initialization unwind. */
-       if (dev->reg_state == NETREG_UNINITIALIZED) {
-               printk(KERN_DEBUG "unregister_netdevice: device %s/%p never "
-                                 "was registered\n", dev->name, dev);
-
-               WARN_ON(1);
-               return;
-       }
-
-       BUG_ON(dev->reg_state != NETREG_REGISTERED);
-
-       /* If device is running, close it first. */
-       dev_close(dev);
-
-       /* And unlink it from device chain. */
-       unlist_netdevice(dev);
-
-       dev->reg_state = NETREG_UNREGISTERING;
-
-       synchronize_net();
-
-       /* Shutdown queueing discipline. */
-       dev_shutdown(dev);
-
-
-       /* Notify protocols, that we are about to destroy
-          this device. They should clean all the things.
-       */
-       call_netdevice_notifiers(NETDEV_UNREGISTER, dev);
-
-       /*
-        *      Flush the unicast and multicast chains
-        */
-       dev_addr_discard(dev);
-
-       if (dev->uninit)
-               dev->uninit(dev);
-
-       /* Notifier chain MUST detach us from master device. */
-       BUG_TRAP(!dev->master);
-
-       /* Remove entries from kobject tree */
-       netdev_unregister_kobject(dev);
-
+       rollback_registered(dev);
        /* Finish processing unregister after unlock */
        net_set_todo(dev);
-
-       synchronize_net();
-
-       dev_put(dev);
 }
 
 /**