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authorRoel Kluin <12o3l@tiscali.nl>2008-04-29 22:01:15 -0400
committerTheodore Ts'o <tytso@mit.edu>2008-04-29 22:01:15 -0400
commitf1fa3342e271029f93d323ca664809b94594fe04 (patch)
treea157efee03b64049dda19f4292961e085949cc81 /fs/ext4
parentf8a87d89304c1eea8e4a8dc02d134f57590913c6 (diff)
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>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/mballoc.c8
1 files changed, 3 insertions, 5 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 11e1fd59acbd..fbec2ef93797 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)
2272 meta_group_info[j] = kzalloc(len, GFP_KERNEL); 2272 meta_group_info[j] = kzalloc(len, GFP_KERNEL);
2273 if (meta_group_info[j] == NULL) { 2273 if (meta_group_info[j] == NULL) {
2274 printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n"); 2274 printk(KERN_ERR "EXT4-fs: can't allocate buddy mem\n");
2275 i--;
2276 goto err_freebuddy; 2275 goto err_freebuddy;
2277 } 2276 }
2278 desc = ext4_get_group_desc(sb, i, NULL); 2277 desc = ext4_get_group_desc(sb, i, NULL);
2279 if (desc == NULL) { 2278 if (desc == NULL) {
2280 printk(KERN_ERR 2279 printk(KERN_ERR
2281 "EXT4-fs: can't read descriptor %lu\n", i); 2280 "EXT4-fs: can't read descriptor %lu\n", i);
2281 i++;
2282 goto err_freebuddy; 2282 goto err_freebuddy;
2283 } 2283 }
2284 memset(meta_group_info[j], 0, len); 2284 memset(meta_group_info[j], 0, len);
@@ -2318,13 +2318,11 @@ static int ext4_mb_init_backend(struct super_block *sb)
2318 return 0; 2318 return 0;
2319 2319
2320err_freebuddy: 2320err_freebuddy:
2321 while (i >= 0) { 2321 while (i-- > 0)
2322 kfree(ext4_get_group_info(sb, i)); 2322 kfree(ext4_get_group_info(sb, i));
2323 i--;
2324 }
2325 i = num_meta_group_infos; 2323 i = num_meta_group_infos;
2326err_freemeta: 2324err_freemeta:
2327 while (--i >= 0) 2325 while (i-- > 0)
2328 kfree(sbi->s_group_info[i]); 2326 kfree(sbi->s_group_info[i]);
2329 iput(sbi->s_buddy_cache); 2327 iput(sbi->s_buddy_cache);
2330err_freesgi: 2328err_freesgi: