net: core: Correctly iterate over lower adjacency list

[cascardo/linux.git] / net / core / dev.c

diff --git a/net/core/dev.c b/net/core/dev.c
index f1fe26f..b09ac57 100644 (file)
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5511,10 +5511,14 @@ struct net_device *netdev_all_lower_get_next_rcu(struct net_device *dev,
 {
        struct netdev_adjacent *lower;
 
-       lower = list_first_or_null_rcu(&dev->all_adj_list.lower,
-                                      struct netdev_adjacent, list);
+       lower = list_entry_rcu((*iter)->next, struct netdev_adjacent, list);
+
+       if (&lower->list == &dev->all_adj_list.lower)
+               return NULL;
+
+       *iter = &lower->list;
 
-       return lower ? lower->dev : NULL;
+       return lower->dev;
 }
 EXPORT_SYMBOL(netdev_all_lower_get_next_rcu);