From e4de2b98c4bdee3b824028cab238392eae6dfc46 Mon Sep 17 00:00:00 2001 From: Yang Yingliang Date: Tue, 3 Jan 2023 20:57:26 +0800 Subject: [PATCH] powercap: fix possible name leak in powercap_register_zone() [ Upstream commit 1b6599f741a4525ca761ecde46e5885ff1e6ba58 ] 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: 75d2364ea0ca ("PowerCap: Add class driver") Signed-off-by: Yang Yingliang Signed-off-by: Rafael J. Wysocki Signed-off-by: Sasha Levin --- drivers/powercap/powercap_sys.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) diff --git a/drivers/powercap/powercap_sys.c b/drivers/powercap/powercap_sys.c index f0654a932b37..ff736b006198 100644 --- a/drivers/powercap/powercap_sys.c +++ b/drivers/powercap/powercap_sys.c @@ -529,9 +529,6 @@ 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); @@ -554,9 +551,16 @@ 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);