[PATCH] ubifs: fix to check error code of register_shrinker

Chao Yu
2015-05-18T08:44:15Z

register_shrinker() in ubifs_init() can fail due to fail to call kzalloc.
This patch fixes to check the return value of register_shrinker, otherwise
our shrinker may be unregistered after ubifs initialized successfully.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
---
fs/ubifs/super.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 75e6f04..fa83d1b 100644
--- a/fs/ubifs/super.c
+++ b/fs/ubifs/super.c
@@ -2245,7 +2245,9 @@ static int __init ubifs_init(void)
if (!ubifs_inode_slab)
return -ENOMEM;

- register_shrinker(&ubifs_shrinker_info);
+ err = register_shrinker(&ubifs_shrinker_info);
+ if (err)
+ goto out_slab;

err = ubifs_compressors_init();
if (err)
@@ -2269,6 +2271,7 @@ out_compr:
ubifs_compressors_exit();
out_shrinker:
unregister_shrinker(&ubifs_shrinker_info);
+out_slab:
kmem_cache_destroy(ubifs_inode_slab);
return err;
}
--
2.3.3