linux-kernel - Re: [PATCH 2/2] thermal: of: fix double-free on unregistration

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Date:   Thu, 13 Jul 2023 14:52:51 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Ahmad Fatoum <a.fatoum@...gutronix.de>
Cc:     Amit Kucheria <amitk@...nel.org>, Zhang Rui <rui.zhang@...el.com>,
        kernel@...gutronix.de, linux-pm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] thermal: of: fix double-free on unregistration

On 11/07/2023 20:05, Rafael J. Wysocki wrote:
> On Sat, Jul 8, 2023 at 1:27 PM Ahmad Fatoum <a.fatoum@...gutronix.de> wrote:
>>
>> Since commit 3d439b1a2ad3 ("thermal/core: Alloc-copy-free the thermal
>> zone parameters structure"), thermal_zone_device_register() allocates
>> a copy of the tzp argument and frees it when unregistering, so
>> thermal_of_zone_register() now ends up leaking its original tzp and
>> double-freeing the tzp copy. Fix this by locating tzp on stack instead.
>>
>> Fixes: 3d439b1a2ad3 ("thermal/core: Alloc-copy-free the thermal zone parameters structure")
>> Signed-off-by: Ahmad Fatoum <a.fatoum@...gutronix.de>
> 
> Daniel, this looks like a genuine fix to me, so I'm inclined to pick
> it up directly.
> 
> Any objections?
> 

No objection

Acked-by: Daniel Lezcano <daniel.lezcano@...aro.org>

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