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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <09a3f091-6201-4911-b8bb-21440f38df07@arm.com>
Date: Fri, 4 Oct 2024 08:57:10 +0100
From: Lukasz Luba <lukasz.luba@....com>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: LKML <linux-kernel@...r.kernel.org>, Linux PM <linux-pm@...r.kernel.org>,
 Daniel Lezcano <daniel.lezcano@...aro.org>, Zhang Rui <rui.zhang@...el.com>,
 Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: [PATCH v2 2/2] thermal: core: Free tzp copy along with the
 thermal zone



On 10/3/24 13:27, Rafael J. Wysocki wrote:
> 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);
> 
> 
> 


Reviewed-by: Lukasz Luba <lukasz.luba@....com>