diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d58df90..bfbd95c 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1401,6 +1401,9 @@
 
 	classzone_idx = zone_idx(preferred_zone);
 
+	if (WARN_ON_ONCE(order >= MAX_ORDER))
+		return NULL;
+
 zonelist_scan:
 	/*
 	 * Scan zonelist, looking for a zone with enough free.