[PATCH 1/2] NTFS: Fix a stupid bug in __ntfs_bitmap_set_bits_in_run()

[Anton Altaparmakov <aia21@cam.ac.uk>]

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>

---

 fs/ntfs/ChangeLog |    3 +++
 fs/ntfs/bitmap.c  |    5 +++--
 2 files changed, 6 insertions(+), 2 deletions(-)

18efefa9355119b4f6d9b73b074ebbf9882c37c3
diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -102,6 +102,9 @@ ToDo/Notes:
 	  inode instead of a vfs inode as parameter.
 	- Fix the definition of the CHKD ntfs record magic.  It had an off by
 	  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
 	 many bug fixes, cleanups, and enhancements...
diff --git a/fs/ntfs/bitmap.c b/fs/ntfs/bitmap.c
--- a/fs/ntfs/bitmap.c
+++ b/fs/ntfs/bitmap.c
@@ -1,7 +1,7 @@
 /*
  * 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
  * 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
 	/* If the first byte is partial, modify the appropriate bits in it. */
 	if (bit) {
 		u8 *byte = kaddr + pos;
-		while ((bit & 7) && cnt--) {
+		while ((bit & 7) && cnt) {
+			cnt--;
 			if (value)
 				*byte |= 1 << bit++;
 			else
-
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