thermal: core: Fix resources release in error paths in thermal_zone_device_register()
Reorder error handling code in order to fix some resources leaks in some
cases:
- 'tz' would leak if 'thermal_zone_create_device_groups()' fails
- memory allocated by 'thermal_zone_create_device_groups()' would leak
if 'device_register()' fails
With this patch, we now have 2 error handling paths: one before
'device_register()', and one after it.
This is needed because some resources are released in 'thermal_release()'.
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c
index 0240c44..2b1b0ba 100644
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -1209,10 +1209,8 @@ thermal_zone_device_register(const char *type, int trips, int mask,
ida_init(&tz->ida);
mutex_init(&tz->lock);
result = ida_simple_get(&thermal_tz_ida, 0, 0, GFP_KERNEL);
- if (result < 0) {
- kfree(tz);
- return ERR_PTR(result);
- }
+ if (result < 0)
+ goto free_tz;
tz->id = result;
strlcpy(tz->type, type, sizeof(tz->type));
@@ -1228,18 +1226,15 @@ thermal_zone_device_register(const char *type, int trips, int mask,
/* Add nodes that are always present via .groups */
result = thermal_zone_create_device_groups(tz, mask);
if (result)
- goto unregister;
+ goto remove_id;
/* A new thermal zone needs to be updated anyway. */
atomic_set(&tz->need_update, 1);
dev_set_name(&tz->device, "thermal_zone%d", tz->id);
result = device_register(&tz->device);
- if (result) {
- ida_simple_remove(&thermal_tz_ida, tz->id);
- kfree(tz);
- return ERR_PTR(result);
- }
+ if (result)
+ goto remove_device_groups;
for (count = 0; count < trips; count++) {
if (tz->ops->get_trip_type(tz, count, &trip_type))
@@ -1293,6 +1288,14 @@ thermal_zone_device_register(const char *type, int trips, int mask,
ida_simple_remove(&thermal_tz_ida, tz->id);
device_unregister(&tz->device);
return ERR_PTR(result);
+
+remove_device_groups:
+ thermal_zone_destroy_device_groups(tz);
+remove_id:
+ ida_simple_remove(&thermal_tz_ida, tz->id);
+free_tz:
+ kfree(tz);
+ return ERR_PTR(result);
}
EXPORT_SYMBOL_GPL(thermal_zone_device_register);
