diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index 55f1b8391149..085c6389afd1 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -517,7 +517,7 @@ static void *__unflatten_device_tree(const void *blob,
 		pr_warning("End of tree marker overwritten: %08x\n",
 			   be32_to_cpup(mem + size));
 
-	if (detached) {
+	if (detached && mynodes) {
 		of_node_set_flag(*mynodes, OF_DETACHED);
 		pr_debug("unflattened tree is detached\n");
 	}