mm/huge_memory: check new folio order when split a folio

[linux-2.6-microblaze.git] / mm / huge_memory.c

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index a81a092..57fca7b 100644 (file)
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -3052,6 +3052,9 @@ int split_huge_page_to_list_to_order(struct page *page, struct list_head *list,
        VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
        VM_BUG_ON_FOLIO(!folio_test_large(folio), folio);
 
+       if (new_order >= folio_order(folio))
+               return -EINVAL;
+
        /* Cannot split anonymous THP to order-1 */
        if (new_order == 1 && folio_test_anon(folio)) {
                VM_WARN_ONCE(1, "Cannot split to order-1 folio");