From: Anton Altaparmakov <aia21@cantab.net>
Date: Thu, 24 Nov 2005 13:41:33 +0000 (+0000)
Subject: NTFS: Fix a potential overflow by casting (index + 1) to s64 before doing a
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=3c6af7fa787f21f8873a050568ed892312899eb5;p=deliverable%2Flinux.git

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@cantab.net>
---

diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 727533891813..c73c8864cbad 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);