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NTFS: Fix a stupid bug in __ntfs_bitmap_set_bits_in_run() which caused the 

count to become negative and hence we had a wild memset() scribbling
      all over the system's ram.

Signed-off-by: Anton Altaparmakov <aia21@cantab.net>
This commit is contained in:
Anton Altaparmakov 2005-10-04 13:06:00 +01:00
parent ed39f731ab
commit 18efefa935
2 changed files with 6 additions and 2 deletions
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3
fs/ntfs/ChangeLog
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@ -102,6 +102,9 @@ ToDo/Notes:
inode instead of a vfs inode as parameter. inode instead of a vfs inode as parameter.
- Fix the definition of the CHKD ntfs record magic. It had an off by - Fix the definition of the CHKD ntfs record magic. It had an off by
two error causing it to be CHKB instead of CHKD. two error causing it to be CHKB instead of CHKD.
- Fix a stupid bug in __ntfs_bitmap_set_bits_in_run() which caused the
count to become negative and hence we had a wild memset() scribbling
all over the system's ram.
2.1.23 - Implement extension of resident files and make writing safe as well as 2.1.23 - Implement extension of resident files and make writing safe as well as
many bug fixes, cleanups, and enhancements... many bug fixes, cleanups, and enhancements...

5
fs/ntfs/bitmap.c
View File

@ -1,7 +1,7 @@
/* /*
* bitmap.c - NTFS kernel bitmap handling. Part of the Linux-NTFS project. * bitmap.c - NTFS kernel bitmap handling. Part of the Linux-NTFS project.
* *
* Copyright (c) 2004 Anton Altaparmakov * Copyright (c) 2004-2005 Anton Altaparmakov
* *
* This program/include file is free software; you can redistribute it and/or * 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 * modify it under the terms of the GNU General Public License as published
@ -90,7 +90,8 @@ int __ntfs_bitmap_set_bits_in_run(struct inode *vi, const s64 start_bit,
/* If the first byte is partial, modify the appropriate bits in it. */ /* If the first byte is partial, modify the appropriate bits in it. */
if (bit) { if (bit) {
u8 *byte = kaddr + pos; u8 *byte = kaddr + pos;
while ((bit & 7) && cnt--) { while ((bit & 7) && cnt) {
cnt--;
if (value) if (value)
*byte |= 1 << bit++; *byte |= 1 << bit++;
else else