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

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

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2005-10-04 13:08:53 +01:00
parent 18efefa935
commit c394e458b6
3 changed files with 4 additions and 3 deletions
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2
fs/ntfs/layout.h
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@ -309,7 +309,7 @@ typedef le16 MFT_RECORD_FLAGS;
* Note: The _LE versions will return a CPU endian formatted value!
*/
#define MFT_REF_MASK_CPU 0x0000ffffffffffffULL
#define MFT_REF_MASK_LE const_cpu_to_le64(0x0000ffffffffffffULL)
#define MFT_REF_MASK_LE const_cpu_to_le64(MFT_REF_MASK_CPU)
typedef u64 MFT_REF;
typedef le64 leMFT_REF;

3
fs/ntfs/mft.c
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@ -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);

2
fs/ntfs/unistr.c
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@ -1,7 +1,7 @@
/*
* unistr.c - NTFS Unicode string handling. Part of the Linux-NTFS project.
*
* Copyright (c) 2001-2004 Anton Altaparmakov
* Copyright (c) 2001-2005 Anton Altaparmakov
*
* This program/include file is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as published