tmpfs: don't undo fallocate past its last page

When fallocate is interrupted it will undo a range that extends one byte
past its range of allocated pages.  This can corrupt an in-use page by
zeroing out its first byte.  Instead, undo using the inclusive byte
range.

Fixes: 1635f6a74152f1d ("tmpfs: undo fallocation on failure")
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Anthony Romano <[email protected]>
Cc: Vlastimil Babka <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Brandon Philips <[email protected]>
Cc: <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/mm/shmem.c b/mm/shmem.c
index a36144909b2840213c087f3eb32fbd10d7c880ee..24463b67b6efa5817e7c1e806d1bf6337d300ba2 100644 (file)
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2227,7 +2227,7 @@ static long shmem_fallocate(struct file *file, int mode, loff_t offset,
                        /* Remove the !PageUptodate pages we added */
                        shmem_undo_range(inode,
                                (loff_t)start << PAGE_SHIFT,
-                               (loff_t)index << PAGE_SHIFT, true);
+                               ((loff_t)index << PAGE_SHIFT) - 1, true);
                        goto undone;
                }