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thermal: core: Reference count the zone in thermal_zone_get_by_id()

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There are places in the thermal netlink code where nothing prevents
the thermal zone object from going away while being accessed after it
has been returned by thermal_zone_get_by_id().

To address this, make thermal_zone_get_by_id() get a reference on the
thermal zone device object to be returned with the help of get_device(),
under thermal_list_lock, and adjust all of its callers to this change
with the help of the cleanup.h infrastructure.

Fixes: 1ce50e7d40 ("thermal: core: genetlink support for events/cmd/sampling")
Cc: 6.8+ <stable@vger.kernel.org> # 6.8+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Link: https://patch.msgid.link/6112242.lOV4Wx5bFT@rjwysocki.net
This commit is contained in:
Rafael J. Wysocki 2024-10-03 14:25:58 +02:00
parent 9852d85ec9
commit a42a5839f4
3 changed files with 7 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/thermal/thermal_core.c
View File

@ -728,6 +728,7 @@ struct thermal_zone_device *thermal_zone_get_by_id(int id)
mutex_lock(&thermal_list_lock);
list_for_each_entry(tz, &thermal_tz_list, node) {
if (tz->id == id) {
get_device(&tz->device);
match = tz;
break;
}

3
drivers/thermal/thermal_core.h
View File

@ -194,6 +194,9 @@ int for_each_thermal_governor(int (*cb)(struct thermal_governor *, void *),
struct thermal_zone_device *thermal_zone_get_by_id(int id);
DEFINE_CLASS(thermal_zone_get_by_id, struct thermal_zone_device *,
if (_T) put_device(&_T->device), thermal_zone_get_by_id(id), int id)
static inline bool cdev_is_power_actor(struct thermal_cooling_device *cdev)
{
return cdev->ops->get_requested_power && cdev->ops->state2power &&

9
drivers/thermal/thermal_netlink.c
View File

@ -443,7 +443,6 @@ static int thermal_genl_cmd_tz_get_trip(struct param *p)
{
struct sk_buff *msg = p->msg;
const struct thermal_trip_desc *td;
struct thermal_zone_device *tz;
struct nlattr *start_trip;
int id;
@ -452,7 +451,7 @@ static int thermal_genl_cmd_tz_get_trip(struct param *p)
id = nla_get_u32(p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
tz = thermal_zone_get_by_id(id);
CLASS(thermal_zone_get_by_id, tz)(id);
if (!tz)
return -EINVAL;
@ -488,7 +487,6 @@ out_cancel_nest:
static int thermal_genl_cmd_tz_get_temp(struct param *p)
{
struct sk_buff *msg = p->msg;
struct thermal_zone_device *tz;
int temp, ret, id;
if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
@ -496,7 +494,7 @@ static int thermal_genl_cmd_tz_get_temp(struct param *p)
id = nla_get_u32(p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
tz = thermal_zone_get_by_id(id);
CLASS(thermal_zone_get_by_id, tz)(id);
if (!tz)
return -EINVAL;
@ -514,7 +512,6 @@ static int thermal_genl_cmd_tz_get_temp(struct param *p)
static int thermal_genl_cmd_tz_get_gov(struct param *p)
{
struct sk_buff *msg = p->msg;
struct thermal_zone_device *tz;
int id, ret = 0;
if (!p->attrs[THERMAL_GENL_ATTR_TZ_ID])
@ -522,7 +519,7 @@ static int thermal_genl_cmd_tz_get_gov(struct param *p)
id = nla_get_u32(p->attrs[THERMAL_GENL_ATTR_TZ_ID]);
tz = thermal_zone_get_by_id(id);
CLASS(thermal_zone_get_by_id, tz)(id);
if (!tz)
return -EINVAL;