[PATCH for-next 7/8] block/rnbd: call kobject_put in the failure path
From: Jack Wang <jinpu.wang@cloud.ionos.com>
Date: 2020-11-26 10:47:48
Subsystem:
block layer, rnbd block drivers, the rest · Maintainers:
Jens Axboe, Md. Haris Iqbal, Jack Wang, Linus Torvalds
From: Guoqing Jiang <redacted> Per the comment of kobject_init_and_add, we need to cleanup the memory by call kobject_put. Also we need to call kobject_del for the other failure cases if the kobject_init_and_add doesn't fail. Signed-off-by: Guoqing Jiang <redacted> Reviewed-by: Md Haris Iqbal <redacted> Signed-off-by: Jack Wang <jinpu.wang@cloud.ionos.com> --- drivers/block/rnbd/rnbd-clt-sysfs.c | 4 +++- drivers/block/rnbd/rnbd-srv-sysfs.c | 28 ++++++++++++++++------------ 2 files changed, 19 insertions(+), 13 deletions(-)
diff --git a/drivers/block/rnbd/rnbd-clt-sysfs.c b/drivers/block/rnbd/rnbd-clt-sysfs.c
index 5d3c3c80dab4..e3c3270b0cee 100644
--- a/drivers/block/rnbd/rnbd-clt-sysfs.c
+++ b/drivers/block/rnbd/rnbd-clt-sysfs.c@@ -450,9 +450,11 @@ static int rnbd_clt_add_dev_kobj(struct rnbd_clt_dev *dev) ret = kobject_init_and_add(&dev->kobj, &rnbd_dev_ktype, gd_kobj, "%s", "rnbd"); - if (ret) + if (ret) { rnbd_clt_err(dev, "Failed to create device sysfs dir, err: %d\n", ret); + kobject_put(&dev->kobj); + } return ret; }
diff --git a/drivers/block/rnbd/rnbd-srv-sysfs.c b/drivers/block/rnbd/rnbd-srv-sysfs.c
index 08ffb492ebfa..05ffe488ddc6 100644
--- a/drivers/block/rnbd/rnbd-srv-sysfs.c
+++ b/drivers/block/rnbd/rnbd-srv-sysfs.c@@ -47,13 +47,17 @@ int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev, ret = kobject_init_and_add(&dev->dev_kobj, &dev_ktype, rnbd_devs_kobj, dev_name); - if (ret) + if (ret) { + kobject_put(&dev->dev_kobj); return ret; + } dev->dev_sessions_kobj = kobject_create_and_add("sessions", &dev->dev_kobj); - if (!dev->dev_sessions_kobj) - goto put_dev_kobj; + if (!dev->dev_sessions_kobj) { + ret = -ENOMEM; + goto free_dev_kobj; + } bdev_kobj = &disk_to_dev(bdev->bd_disk)->kobj; ret = sysfs_create_link(&dev->dev_kobj, bdev_kobj, "block_dev");
@@ -64,7 +68,8 @@ int rnbd_srv_create_dev_sysfs(struct rnbd_srv_dev *dev, put_sess_kobj: kobject_put(dev->dev_sessions_kobj); -put_dev_kobj: +free_dev_kobj: + kobject_del(&dev->dev_kobj); kobject_put(&dev->dev_kobj); return ret; }
@@ -196,18 +201,17 @@ int rnbd_srv_create_dev_session_sysfs(struct rnbd_srv_sess_dev *sess_dev) ret = kobject_init_and_add(&sess_dev->kobj, &rnbd_srv_sess_dev_ktype, sess_dev->dev->dev_sessions_kobj, "%s", sess_dev->sess->sessname); - if (ret) + if (ret) { + kobject_put(&sess_dev->kobj); return ret; + } ret = sysfs_create_group(&sess_dev->kobj, &rnbd_srv_default_dev_session_attr_group); - if (ret) - goto err; - - return 0; - -err: - kobject_put(&sess_dev->kobj); + if (ret) { + kobject_del(&sess_dev->kobj); + kobject_put(&sess_dev->kobj); + } return ret; }
--
2.25.1