NTFS: Fix a potential overflow by casting (index + 1) to s64 before doing a
Anton Altaparmakov [Thu, 24 Nov 2005 13:41:33 +0000 (13:41 +0000)]
      left shift using PAGE_CACHE_SHIFT in fs/ntfs/file.c.  Thanks to Andrew
      Morton pointing this out to.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>

fs/ntfs/file.c

index 7275338..c73c886 100644 (file)
@@ -248,7 +248,7 @@ do_non_resident_extend:
                 * enough to make ntfs_writepage() work.
                 */
                write_lock_irqsave(&ni->size_lock, flags);
-               ni->initialized_size = (index + 1) << PAGE_CACHE_SHIFT;
+               ni->initialized_size = (s64)(index + 1) << PAGE_CACHE_SHIFT;
                if (ni->initialized_size > new_init_size)
                        ni->initialized_size = new_init_size;
                write_unlock_irqrestore(&ni->size_lock, flags);