[PATCH 1/5] NTFS: Fix a potential overflow by casting (index + 1)to s64

[Anton Altaparmakov]

NTFS: Fix a potential overflow by casting (index + 1) to s64 before doing a
      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@xxxxxxxxxx>

---

Best regards,

	Anton
-- 
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net
WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/

 fs/ntfs/file.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

3c6af7fa787f21f8873a050568ed892312899eb5
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 7275338..c73c886 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -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);
-- 
1.2.3.g9821
-
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