diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index a9b5ebc1af2106cb12baaaae014f4d9b05430e1b..087f2434813a8b1fb0b4129643c1cae61c53dff6 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -402,16 +402,24 @@ static size_t rtnl_link_get_slave_info_data_size(const struct net_device *dev)
 {
 	struct net_device *master_dev;
 	const struct rtnl_link_ops *ops;
+	size_t size = 0;
 
-	master_dev = netdev_master_upper_dev_get((struct net_device *) dev);
+	rcu_read_lock();
+
+	master_dev = netdev_master_upper_dev_get_rcu((struct net_device *)dev);
 	if (!master_dev)
-		return 0;
+		goto out;
+
 	ops = master_dev->rtnl_link_ops;
 	if (!ops || !ops->get_slave_size)
-		return 0;
+		goto out;
 	/* IFLA_INFO_SLAVE_DATA + nested data */
-	return nla_total_size(sizeof(struct nlattr)) +
+	size = nla_total_size(sizeof(struct nlattr)) +
 	       ops->get_slave_size(master_dev, dev);
+
+out:
+	rcu_read_unlock();
+	return size;
 }
 
 static size_t rtnl_link_get_size(const struct net_device *dev)