diff --git a/net/core/dev.c b/net/core/dev.c
index 36e9945..f68122f 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -7583,8 +7583,9 @@ int dev_set_mtu(struct net_device *dev, int new_mtu)
 	struct netlink_ext_ack extack;
 	int err;
 
+	memset(&extack, 0, sizeof(extack));
 	err = dev_set_mtu_ext(dev, new_mtu, &extack);
-	if (err)
+	if (err && extack._msg)
 		net_err_ratelimited("%s: %s\n", dev->name, extack._msg);
 	return err;
 }