NTFS: Fix an (innocent) off-by-one error in the runlist code.

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

5 files changed, 17 insertions, 7 deletions

diff --git a/fs/ntfs/ChangeLog b/fs/ntfs/ChangeLog
index 9d8ffa89e2c2..3d8d60be48de 100644
--- a/fs/ntfs/ChangeLog
+++ b/fs/ntfs/ChangeLog
@@ -19,6 +19,12 @@ ToDo/Notes:
         - Enable the code for setting the NT4 compatibility flag when we start
           making NTFS 1.2 specific modifications.
 
+2.1.27 - Various bug fixes.
+
+        - Fix two compiler warnings on Alpha.  Thanks to Andrew Morton for
+          reporting them.
+        - Fix an (innocent) off-by-one error in the runlist code.
+
 2.1.26 - Minor bug fixes and updates.
 
         - Fix a potential overflow in file.c where a cast to s64 was missing in
diff --git a/fs/ntfs/Makefile b/fs/ntfs/Makefile
index d95fac7fdeb6..e27b4eacffbf 100644
--- a/fs/ntfs/Makefile
+++ b/fs/ntfs/Makefile
@@ -6,7 +6,7 @@ ntfs-objs := aops.o attrib.o collate.o compress.o debug.o dir.o file.o \
              index.o inode.o mft.o mst.o namei.o runlist.o super.o sysctl.o \
              unistr.o upcase.o
 
-EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.26\"
+EXTRA_CFLAGS = -DNTFS_VERSION=\"2.1.27\"
 
 ifeq ($(CONFIG_NTFS_DEBUG),y)
 EXTRA_CFLAGS += -DDEBUG
diff --git a/fs/ntfs/namei.c b/fs/ntfs/namei.c
index 5ea9eb93af62..78e0cf738e24 100644
--- a/fs/ntfs/namei.c
+++ b/fs/ntfs/namei.c
@@ -2,7 +2,7 @@
  * namei.c - NTFS kernel directory inode operations. Part of the Linux-NTFS
  *           project.
  *
- * Copyright (c) 2001-2004 Anton Altaparmakov
+ * Copyright (c) 2001-2006 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
diff --git a/fs/ntfs/runlist.c b/fs/ntfs/runlist.c
index 061b5ff6b73c..eb52b801512b 100644
--- a/fs/ntfs/runlist.c
+++ b/fs/ntfs/runlist.c
@@ -381,6 +381,7 @@ static inline runlist_element *ntfs_rl_insert(runlist_element *dst,
 static inline runlist_element *ntfs_rl_replace(runlist_element *dst,
                 int dsize, runlist_element *src, int ssize, int loc)
 {
+        signed delta;
         BOOL left = FALSE;      /* Left end of @src needs merging. */
         BOOL right = FALSE;     /* Right end of @src needs merging. */
         int tail;               /* Start of tail of @dst. */
@@ -396,11 +397,14 @@ static inline runlist_element *ntfs_rl_replace(runlist_element *dst,
                 left = ntfs_are_rl_mergeable(dst + loc - 1, src);
         /*
          * Allocate some space.  We will need less if the left, right, or both
-         * ends get merged.
+         * ends get merged.  The -1 accounts for the run being replaced.
          */
-        dst = ntfs_rl_realloc(dst, dsize, dsize + ssize - left - right);
-        if (IS_ERR(dst))
-                return dst;
+        delta = ssize - 1 - left - right;
+        if (delta > 0) {
+                dst = ntfs_rl_realloc(dst, dsize, dsize + delta);
+                if (IS_ERR(dst))
+                        return dst;
+        }
         /*
          * We are guaranteed to succeed from here so can start modifying the
          * original runlists.
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index 368a8ec10668..71c58eca580e 100644
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -3234,7 +3234,7 @@ static void __exit exit_ntfs_fs(void)
 }
 
 MODULE_AUTHOR("Anton Altaparmakov <aia21@cantab.net>");
-MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2005 Anton Altaparmakov");
+MODULE_DESCRIPTION("NTFS 1.2/3.x driver - Copyright (c) 2001-2006 Anton Altaparmakov");
 MODULE_VERSION(NTFS_VERSION);
 MODULE_LICENSE("GPL");
 #ifdef DEBUG