[BRIDGE]: fix locking and memory leak in br_add_bridge

There are several bugs in error handling in br_add_bridge: - when dev_alloc_name fails, allocated net_device is not freed - unregister_netdev is called when rtnl lock is held - free_netdev is called before netdev_run_todo has a chance to be run after unregistering net_device Signed-off-by: Jiri Benc <[email protected]> Signed-off-by: Stephen Hemminger <[email protected]> Signed-off-by: David S. Miller <[email protected]>
chewitt · Jun 5, 2006 · 3648570 · 3648570
1 parent 8c893ff
commit 3648570
Showing 1 changed file with 7 additions and 12 deletions.
diff --git a/net/bridge/br_if.c b/net/bridge/br_if.c
@@ -300,25 +300,20 @@ int br_add_bridge(const char *name)
 	rtnl_lock();
 	if (strchr(dev->name, '%')) {
 		ret = dev_alloc_name(dev, dev->name);
-		if (ret < 0)
-			goto err1;
+		if (ret < 0) {
+			free_netdev(dev);
+			goto out;
+		}
 	}
 
 	ret = register_netdevice(dev);
 	if (ret)
-		goto err2;
+		goto out;
 
 	ret = br_sysfs_addbr(dev);
 	if (ret)
-		goto err3;
-	rtnl_unlock();
-	return 0;
-
- err3:
-	unregister_netdev(dev);
- err2:
-	free_netdev(dev);
- err1:
+		unregister_netdevice(dev);
+ out:
 	rtnl_unlock();
 	return ret;
 }