1 files changed, 3 insertions, 0 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index 61ba5e405791..4ee2e998e937 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1029,6 +1029,9 @@ find_page:
                                 goto page_not_up_to_date;
                         if (!trylock_page(page))
                                 goto page_not_up_to_date;
+                        /* Did it get truncated before we got the lock? */
+                        if (!page->mapping)
+                                goto page_not_up_to_date_locked;
                         if (!mapping->a_ops->is_partially_uptodate(page,
                                                                 desc, offset))
                                 goto page_not_up_to_date_locked;