linux-kernel - [PATCH] fs: nilfs2: fix memory leak in nilfs_sysfs_create_device

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Date:   Thu, 20 Jan 2022 21:44:14 +0800
From:   Dongliang Mu <dzm91@...t.edu.cn>
To:     Ryusuke Konishi <konishi.ryusuke@...il.com>,
        Pavel Skripkin <paskripkin@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Dongliang Mu <dzm91@...t.edu.cn>, linux-nilfs@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH] fs: nilfs2: fix memory leak in nilfs_sysfs_create_device_group

The preivous commit 8fd0c1b0647a ("nilfs2: fix memory leak in
nilfs_sysfs_delete_device_group") only handles the memory leak in the
nilfs_sysfs_delete_device_group. However, the similar memory leak still
occurs in the nilfs_sysfs_create_device_group.

Fix it by adding kobject_del when
kobject_init_and_add succeeds, but one of the following calls fails.

Fixes: 8fd0c1b0647a ("nilfs2: fix memory leak in nilfs_sysfs_delete_device_group")
Signed-off-by: Dongliang Mu <dzm91@...t.edu.cn>
---
 fs/nilfs2/sysfs.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
index 379d22e28ed6..0b2db2b499d5 100644
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -995,7 +995,7 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
 
 	err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
 	if (err)
-		goto cleanup_dev_kobject;
+		goto delete_dev_kobject;
 
 	err = nilfs_sysfs_create_checkpoints_group(nilfs);
 	if (err)
@@ -1027,6 +1027,9 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
 delete_mounted_snapshots_group:
 	nilfs_sysfs_delete_mounted_snapshots_group(nilfs);
 
+delete_dev_kobject:
+	kobject_del(&nilfs->ns_dev_kobj);
+
 cleanup_dev_kobject:
 	kobject_put(&nilfs->ns_dev_kobj);
 	kfree(nilfs->ns_dev_subgroups);
-- 
2.25.1