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[v1,1/3] thermal/debugfs: Free all thermal zone debug memory on zone removal

Message ID 4918398.31r3eYUQgx@kreacher
State New
Headers show
Series thermal/debugfs: Fix a memory leak on removal and locking | expand

Commit Message

Rafael J. Wysocki April 25, 2024, 1:49 p.m. UTC 
From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

Because thermal_debug_tz_remove() does not free all memory allocated for
thermal zone diagnostics, some of that memory becomes unreachable after
freeing the thermal zone's struct thermal_debugfs object.

Address this by making thermal_debug_tz_remove() free all of the memory
in question.

Fixes: 7ef01f228c9f ("thermal/debugfs: Add thermal debugfs information for mitigation episodes")
Cc :6.8+ <stable@vger.kernel.org> # 6.8+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---
 drivers/thermal/thermal_debugfs.c |   13 +++++++++++++
 1 file changed, 13 insertions(+)
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Patch

Index: linux-pm/drivers/thermal/thermal_debugfs.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_debugfs.c
+++ linux-pm/drivers/thermal/thermal_debugfs.c
@@ -832,15 +832,28 @@  void thermal_debug_tz_add(struct thermal
 void thermal_debug_tz_remove(struct thermal_zone_device *tz)
 {
 	struct thermal_debugfs *thermal_dbg = tz->debugfs;
+	struct tz_episode *tze, *tmp;
+	struct tz_debugfs *tz_dbg;
+	int *trips_crossed;
 
 	if (!thermal_dbg)
 		return;
 
+	tz_dbg = &thermal_dbg->tz_dbg;
+
 	mutex_lock(&thermal_dbg->lock);
 
+	trips_crossed = tz_dbg->trips_crossed;
+
+	list_for_each_entry_safe(tze, tmp, &tz_dbg->tz_episodes, node) {
+		list_del(&tze->node);
+		kfree(tze);
+	}
+
 	tz->debugfs = NULL;
 
 	mutex_unlock(&thermal_dbg->lock);
 
 	thermal_debugfs_remove_id(thermal_dbg);
+	kfree(trips_crossed);
 }