From: Chao Yu <chao2.yu@samsung.com>
Date: Mon, 18 May 2015 08:43:02 +0000 (+0800)
Subject: ubifs: fix to check error code of register_shrinker
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a1fe33af5f8c5f5aebe68d22125d19e48b8e601c;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

ubifs: fix to check error code of register_shrinker

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>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
---

diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c
index 75e6f04bb795..fa83d1bbba44 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;
 }