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powercap: fix possible name leak in powercap_register_zone() 

In the error path after calling dev_set_name(), the device
name is leaked. To fix this, calling dev_set_name() before
device_register(), and call put_device() if it returns error.

All the resources is released in powercap_release(), so it
can return from powercap_register_zone() directly.

Fixes: 75d2364ea0 ("PowerCap: Add class driver")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Yang Yingliang 2023-01-03 20:57:26 +08:00 committed by Rafael J. Wysocki
parent 5dc4c995db
commit 1b6599f741
1 changed files with 9 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
drivers/powercap/powercap_sys.c
View File

@ -530,9 +530,6 @@ struct powercap_zone *powercap_register_zone(
power_zone->name = kstrdup(name, GFP_KERNEL);
if (!power_zone->name)
goto err_name_alloc;
dev_set_name(&power_zone->dev, "%s:%x",
dev_name(power_zone->dev.parent),
power_zone->id);
power_zone->constraints = kcalloc(nr_constraints,
sizeof(*power_zone->constraints),
GFP_KERNEL);
@ -555,9 +552,16 @@ struct powercap_zone *powercap_register_zone(
power_zone->dev_attr_groups[0] = &power_zone->dev_zone_attr_group;
power_zone->dev_attr_groups[1] = NULL;
power_zone->dev.groups = power_zone->dev_attr_groups;
dev_set_name(&power_zone->dev, "%s:%x",
dev_name(power_zone->dev.parent),
power_zone->id);
result = device_register(&power_zone->dev);
if (result)
goto err_dev_ret;
if (result) {
put_device(&power_zone->dev);
mutex_unlock(&control_type->lock);
return ERR_PTR(result);
}
control_type->nr_zones++;
mutex_unlock(&control_type->lock);