nilfs2: fix memory leak in nilfs_sysfs_create_snapshot_group

[ Upstream commit b2fe39c248f3fa4bbb2a20759b4fdd83504190f7 ]

If kobject_init_and_add returns with error, kobject_put() is needed here
to avoid memory leak, because kobject_init_and_add may return error
without freeing the memory associated with the kobject it allocated.

Link: https://lkml.kernel.org/r/20210629022556.3985106-6-sunnanyong@huawei.com
Link: https://lkml.kernel.org/r/1625651306-10829-6-git-send-email-konishi.ryusuke@gmail.com
Signed-off-by: Nanyong Sun <sunnanyong@huawei.com>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/nilfs2/sysfs.c b/fs/nilfs2/sysfs.c
index 31eed118d0ce5e4b48cd97aab17f0c7b830c1b59..28f5572c6aae435f8adad20ec77778962a856a9c 100644 (file)
--- a/fs/nilfs2/sysfs.c
+++ b/fs/nilfs2/sysfs.c
@@ -217,9 +217,9 @@ int nilfs_sysfs_create_snapshot_group(struct nilfs_root *root)
        }
 
        if (err)
-               return err;
+               kobject_put(&root->snapshot_kobj);
 
-       return 0;
+       return err;
 }
 
 void nilfs_sysfs_delete_snapshot_group(struct nilfs_root *root)