linux-kernel - [PATCH v4] ext3, ext4: make i signed in do

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Date:	Tue, 02 Dec 2008 22:01:14 +0100
From:	Roel Kluin <roel.kluin@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	sct@...hat.com, adilger@....com, linux-ext4@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v4] ext3, ext4: make i signed in do_split()

Andrew Morton wrote:
> On Sat, 29 Nov 2008 04:40:42 -0500
> roel kluin <roel.kluin@...il.com> wrote:
> 
>> unsigned i >= 0 is always true

>> -	for (i = count-1; i >= 0; i--) {
>> +	for (i = count-1; i < count; i--) {
			break;

> A local variable called `i' should always have signed type.  In fact,
> it should have `int' type.

You are right. although count is unsigned, dx_make_map() returns int, which is
assigned to count, so this should fit in an int. (If you ack this, make sure to
get this patch, and not one of the others.)
--------------->8----------------8<--------------------
Make i signed, otherwise the loop will not end when it becomes negative.

Signed-off-by: Roel Kluin <roel.kluin@...il.com>
---
diff --git a/fs/ext3/namei.c b/fs/ext3/namei.c
index 3e5edc9..4846327 100644
--- a/fs/ext3/namei.c
+++ b/fs/ext3/namei.c
@@ -1156,9 +1156,9 @@ static struct ext3_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 	u32 hash2;
 	struct dx_map_entry *map;
 	char *data1 = (*bh)->b_data, *data2;
-	unsigned split, move, size, i;
+	unsigned split, move, size;
 	struct ext3_dir_entry_2 *de = NULL, *de2;
-	int	err = 0;
+	int	err = 0, i;
 
 	bh2 = ext3_append (handle, dir, &newblock, &err);
 	if (!(bh2)) {
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 63adcb7..bca90c1 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1166,9 +1166,9 @@ static struct ext4_dir_entry_2 *do_split(handle_t *handle, struct inode *dir,
 	u32 hash2;
 	struct dx_map_entry *map;
 	char *data1 = (*bh)->b_data, *data2;
-	unsigned split, move, size, i;
+	unsigned split, move, size;
 	struct ext4_dir_entry_2 *de = NULL, *de2;
-	int	err = 0;
+	int	err = 0, i;
 
 	bh2 = ext4_append (handle, dir, &newblock, &err);
 	if (!(bh2)) {
--
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