linux-kernel - Re: [PATCH -next] thermal/drivers/thermal_hwmon: Fix a kernel NULL pointer dereference

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Date:   Wed, 29 Mar 2023 20:39:04 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
        rafael.j.wysocki@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -next] thermal/drivers/thermal_hwmon: Fix a kernel NULL
 pointer dereference

On 29/03/2023 19:43, Rafael J. Wysocki wrote:

[ ... ]

>>> What about the message printed when temp is NULL.  Should the original
>>> form of it be restored too?
>>
>> Yes, you are right, for the sake of consistency we should restore also
>> this one.
> 
> So I'm going to apply the appended patch.
> 
> Please let me know if there are any concerns regarding it.
> 
> ---
> From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Subject: [PATCH] thermal: thermal_hwmon: Revert recent message adjustment
> 
> For the sake of consistency, revert the second part of the
> thermal_hwmon.c hunk from commit dec07d399cc8 ("thermal: Don't use
> 'device' internal thermal zone structure field") after the first
> part of it has been reverted.
> 
> Link: https://lore.kernel.org/linux-pm/5b084360-898b-aad0-0b8e-33acc585d71d@linaro.org
> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

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


> ---
>   drivers/thermal/thermal_hwmon.c |    2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> Index: linux-pm/drivers/thermal/thermal_hwmon.c
> ===================================================================
> --- linux-pm.orig/drivers/thermal/thermal_hwmon.c
> +++ linux-pm/drivers/thermal/thermal_hwmon.c
> @@ -236,7 +236,7 @@ void thermal_remove_hwmon_sysfs(struct t
>   	temp = thermal_hwmon_lookup_temp(hwmon, tz);
>   	if (unlikely(!temp)) {
>   		/* Should never happen... */
> -		dev_dbg(hwmon->device, "temperature input lookup failed!\n");
> +		dev_dbg(&tz->device, "temperature input lookup failed!\n");
>   		return;
>   	}


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