diff --git a/include/net/addrconf.h b/include/net/addrconf.h
index 6df79e9..f44ff24 100644
--- a/include/net/addrconf.h
+++ b/include/net/addrconf.h
@@ -336,6 +336,16 @@ static inline void in6_dev_put(struct inet6_dev *idev)
 		in6_dev_finish_destroy(idev);
 }
 
+static inline void in6_dev_put_clear(struct inet6_dev **pidev)
+{
+	struct inet6_dev *idev = *pidev;
+
+	if (idev) {
+		in6_dev_put(idev);
+		*pidev = NULL;
+	}
+}
+
 static inline void __in6_dev_put(struct inet6_dev *idev)
 {
 	refcount_dec(&idev->refcnt);
diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 99d4727..94d6a13 100644
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -3721,10 +3721,10 @@ static int ip6_route_dev_notify(struct notifier_block *this,
 		/* NETDEV_UNREGISTER could be fired for multiple times by
 		 * netdev_wait_allrefs(). Make sure we only call this once.
 		 */
-		in6_dev_put(net->ipv6.ip6_null_entry->rt6i_idev);
+		in6_dev_put_clear(&net->ipv6.ip6_null_entry->rt6i_idev);
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
-		in6_dev_put(net->ipv6.ip6_prohibit_entry->rt6i_idev);
-		in6_dev_put(net->ipv6.ip6_blk_hole_entry->rt6i_idev);
+		in6_dev_put_clear(&net->ipv6.ip6_prohibit_entry->rt6i_idev);
+		in6_dev_put_clear(&net->ipv6.ip6_blk_hole_entry->rt6i_idev);
 #endif
 	}