diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index 92030ead2506..25b7e412c20b 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -1632,11 +1632,11 @@ static int kernel_get_mempolicy(int __user *policy,
 	int pval;
 	nodemask_t nodes;
 
-	addr = untagged_addr(addr);
-
 	if (nmask != NULL && maxnode < nr_node_ids)
 		return -EINVAL;
 
+	addr = untagged_addr(addr);
+
 	err = do_get_mempolicy(&pval, &nodes, addr, flags);
 
 	if (err)