NTFS: Fix a 64-bitness bug where a left-shift could overflow a 32-bit variable

      which we now cast to 64-bit first (fs/ntfs/mft.c::map_mft_record_page().

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

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/ntfs/mft.c b/fs/ntfs/mft.c
index 247586d1d5dc..b011369b5956 100644
--- a/fs/ntfs/mft.c
+++ b/fs/ntfs/mft.c
@@ -58,7 +58,8 @@ static inline MFT_RECORD *map_mft_record_page(ntfs_inode *ni)
          * overflowing the unsigned long, but I don't think we would ever get
          * here if the volume was that big...
          */
-        index = ni->mft_no << vol->mft_record_size_bits >> PAGE_CACHE_SHIFT;
+        index = (u64)ni->mft_no << vol->mft_record_size_bits >>
+                        PAGE_CACHE_SHIFT;
         ofs = (ni->mft_no << vol->mft_record_size_bits) & ~PAGE_CACHE_MASK;
 
         i_size = i_size_read(mft_vi);