linux-kernel - [PATCH v2 2/2] thermal: core: Free tzp copy along with the thermal zone

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Message-ID: <4623516.LvFx2qVVIh@rjwysocki.net>
Date: Thu, 03 Oct 2024 14:27:28 +0200
From: "Rafael J. Wysocki" <rjw@...ysocki.net>
To: Linux PM <linux-pm@...r.kernel.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>,
 Lukasz Luba <lukasz.luba@....com>, Zhang Rui <rui.zhang@...el.com>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject:
 [PATCH v2 2/2] thermal: core: Free tzp copy along with the thermal zone

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

The object pointed to by tz->tzp may still be accessed after being
freed in thermal_zone_device_unregister(), so move the freeing of it
to the point after the removal completion has been completed at which
it cannot be accessed any more.

Fixes: 3d439b1a2ad3 ("thermal/core: Alloc-copy-free the thermal zone parameters structure")
Cc: 6.8+ <stable@...r.kernel.org> # 6.8+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---

v1 -> v2: No changes

---
 drivers/thermal/thermal_core.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Index: linux-pm/drivers/thermal/thermal_core.c
===================================================================
--- linux-pm.orig/drivers/thermal/thermal_core.c
+++ linux-pm/drivers/thermal/thermal_core.c
@@ -1606,14 +1606,12 @@ void thermal_zone_device_unregister(stru
 	ida_destroy(&tz->ida);

 	device_del(&tz->device);
-
-	kfree(tz->tzp);
-
 	put_device(&tz->device);

 	thermal_notify_tz_delete(tz);

 	wait_for_completion(&tz->removal);
+	kfree(tz->tzp);
 	kfree(tz);
 }
 EXPORT_SYMBOL_GPL(thermal_zone_device_unregister);