linux-kernel - [PATCH] nilfs2: Fix reference count leak in nilfs_sysfs_create_device

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Date:   Wed, 27 May 2020 15:09:33 -0500
From:   wu000273@....edu
To:     kjlu@....edu
Cc:     wu000273@....edu, Ryusuke Konishi <konishi.ryusuke@...il.com>,
        Vyacheslav Dubeyko <Vyacheslav.Dubeyko@...t.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-nilfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] nilfs2: Fix reference count leak in nilfs_sysfs_create_device_group

From: Qiushi Wu <wu000273@....edu>

kobject_init_and_add() takes reference even when it fails.
In nilfs_sysfs_create_device_group(), the memory allocated by
kobject_init_and_add() is not freed when kobject_init_and_add()
fails. Thus replace the jump target "free_dev_subgroups" by
"cleanup_dev_kobject".

Fixes: da7141fb78db ("nilfs2: add /sys/fs/nilfs2/<device> group")
Signed-off-by: Qiushi Wu <wu000273@....edu>
---
 fs/nilfs2/sysfs.c | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
index e60be7bb55b0..4a74756d52fe 100644
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -1000,7 +1000,7 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
 	err = kobject_init_and_add(&nilfs->ns_dev_kobj, &nilfs_dev_ktype, NULL,
 				    "%s", sb->s_id);
 	if (err)
-		goto free_dev_subgroups;
+		goto cleanup_dev_kobject;
 
 	err = nilfs_sysfs_create_mounted_snapshots_group(nilfs);
 	if (err)
@@ -1038,8 +1038,6 @@ int nilfs_sysfs_create_device_group(struct super_block *sb)
 
 cleanup_dev_kobject:
 	kobject_del(&nilfs->ns_dev_kobj);
-
-free_dev_subgroups:
 	kfree(nilfs->ns_dev_subgroups);
 
 failed_create_device_group:
-- 
2.17.1