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 <[email protected]>
---
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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