From f1fa3342e271029f93d323ca664809b94594fe04 Mon Sep 17 00:00:00 2001
From: Roel Kluin <12o3l@tiscali.nl>
Date: Tue, 29 Apr 2008 22:01:15 -0400
Subject: ext4: fix hot spins in mballoc after err_freebuddy and err_freemeta
In ext4_mb_init_backend() 'i' is of type ext4_group_t. Since unsigned, i
>= 0 is always true, so fix hot spins after err_freebuddy: and -meta:
and prevent decrements when zero.
Signed-off-by: Roel Kluin <12o3l@tiscali.nl>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
---
fs/ext4/mballoc.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
(limited to 'fs')
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 11e1fd59acb..fbec2ef9379 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2272,13 +2272,13 @@ static int ext4_mb_init_backend(struct super_block *sb)
meta_group_info[j] = kzalloc(len, GFP_KERNEL);
if (meta_group_info[j] == NULL) {
printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n");
- i--;
goto err_freebuddy;
}
desc = ext4_get_group_desc(sb, i, NULL);
if (desc == NULL) {
printk(KERN_ERR
"EXT4-fs: can't read descriptor %lu\n", i);
+ i++;
goto err_freebuddy;
}
memset(meta_group_info[j], 0, len);
@@ -2318,13 +2318,11 @@ static int ext4_mb_init_backend(struct super_block *sb)
return 0;
err_freebuddy:
- while (i >= 0) {
+ while (i-- > 0)
kfree(ext4_get_group_info(sb, i));
- i--;
- }
i = num_meta_group_infos;
err_freemeta:
- while (--i >= 0)
+ while (i-- > 0)
kfree(sbi->s_group_info[i]);
iput(sbi->s_buddy_cache);
err_freesgi:
--
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