6.11-stable review patch. If anyone has any objections, please let me know.
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From: Rafael J. Wysocki rafael.j.wysocki@intel.com
commit a42a5839f400e929c489bb1b58f54596c4535167 upstream.
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: 1ce50e7d408e ("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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/thermal/thermal_core.c | 1 + drivers/thermal/thermal_core.h | 3 +++ drivers/thermal/thermal_netlink.c | 9 +++------ 3 files changed, 7 insertions(+), 6 deletions(-)
--- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -737,6 +737,7 @@ struct thermal_zone_device *thermal_zone 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; } --- a/drivers/thermal/thermal_core.h +++ b/drivers/thermal/thermal_core.h @@ -194,6 +194,9 @@ int for_each_thermal_governor(int (*cb)(
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 && --- a/drivers/thermal/thermal_netlink.c +++ b/drivers/thermal/thermal_netlink.c @@ -443,7 +443,6 @@ static int thermal_genl_cmd_tz_get_trip( { 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(
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(
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( 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(s
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;