net: avoid UAF on deleted altname

Altnames are accessed under RCU (dev_get_by_name_rcu())
but freed by kfree() with no synchronization point.

Each node has one or two allocations (node and a variable-size
name, sometimes the name is netdev->name). Adding rcu_heads
here is a bit tedious. Besides most code which unlists the names
already has rcu barriers - so take the simpler approach of adding
synchronize_rcu(). Note that the one on the unregistration path
(which matters more) is removed by the next fix.

Fixes: ff92741270bf ("net: introduce name_node struct to be used in hashlist")
Reviewed-by: Jiri Pirko <jiri@nvidia.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/net/core/dev.c b/net/core/dev.c
index ae55719..559705a 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -345,7 +345,6 @@ int netdev_name_node_alt_create(struct net_device *dev, const char *name)
 static void __netdev_name_node_alt_destroy(struct netdev_name_node *name_node)
 {
        list_del(&name_node->list);
-       netdev_name_node_del(name_node);
        kfree(name_node->name);
        netdev_name_node_free(name_node);
 }
@@ -364,6 +363,8 @@ int netdev_name_node_alt_destroy(struct net_device *dev, const char *name)
        if (name_node == dev->name_node || name_node->dev != dev)
                return -EINVAL;
 
+       netdev_name_node_del(name_node);
+       synchronize_rcu();
        __netdev_name_node_alt_destroy(name_node);
 
        return 0;
@@ -10941,6 +10942,7 @@ void unregister_netdevice_many_notify(struct list_head *head,
        synchronize_net();
 
        list_for_each_entry(dev, head, unreg_list) {
+               struct netdev_name_node *name_node;
                struct sk_buff *skb = NULL;
 
                /* Shutdown queueing discipline. */
@@ -10968,6 +10970,9 @@ void unregister_netdevice_many_notify(struct list_head *head,
                dev_uc_flush(dev);
                dev_mc_flush(dev);
 
+               netdev_for_each_altname(dev, name_node)
+                       netdev_name_node_del(name_node);
+               synchronize_rcu();
                netdev_name_node_alt_flush(dev);
                netdev_name_node_free(dev->name_node);