scsi: scsi_debug: Fix possible name leak in sdebug_add_host_helper()

[ Upstream commit e6d773f93a ]

Afer commit 1fa5ae857b ("driver core: get rid of struct device's bus_id
string array"), the name of device is allocated dynamically, it needs be
freed when device_register() returns error.

As comment of device_register() says, one should use put_device() to give
up the reference in the error path. Fix this by calling put_device(), then
the name can be freed in kobject_cleanup(), and sdbg_host is freed in
sdebug_release_adapter().

When the device release is not set, it means the device is not initialized.
We can not call put_device() in this case. Use kfree() to free memory.

Fixes: 1fa5ae857b ("driver core: get rid of struct device's bus_id string array")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20221112131010.3757845-1-yangyingliang@huawei.com
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

drivers/scsi/scsi_debug.c

@@ -7156,7 +7156,10 @@ clean:
 		kfree(sdbg_devinfo->zstate);
 		kfree(sdbg_devinfo);
 	}
-	kfree(sdbg_host);
+	if (sdbg_host->dev.release)
+		put_device(&sdbg_host->dev);
+	else
+		kfree(sdbg_host);
 	pr_warn("%s: failed, errno=%d\n", __func__, -error);
 	return error;
 }