1 files changed, 6 insertions, 0 deletions

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ce63d603820f..d02d6436add0 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -466,6 +466,7 @@ void prep_compound_page(struct page *page, unsigned int order)
         for (i = 1; i < nr_pages; i++) {
                 struct page *p = page + i;
                 set_page_count(p, 0);
+                p->mapping = TAIL_MAPPING;
                 set_compound_head(p, page);
         }
 }
@@ -856,6 +857,10 @@ static int free_tail_pages_check(struct page *head_page, struct page *page)
                 ret = 0;
                 goto out;
         }
+        if (page->mapping != TAIL_MAPPING) {
+                bad_page(page, "corrupted mapping in tail page", 0);
+                goto out;
+        }
         if (unlikely(!PageTail(page))) {
                 bad_page(page, "PageTail not set", 0);
                 goto out;
@@ -866,6 +871,7 @@ static int free_tail_pages_check(struct page *head_page, struct page *page)
         }
         ret = 0;
 out:
+        page->mapping = NULL;
         clear_compound_head(page);
         return ret;
 }