linux-kernel - Re: [PATCH] hwmon: (hp-wmi-sensors) Initialize pevents in hp_wmi_sensors

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Message-ID: <324b865f-9afb-43cf-8a84-b16c360fbcce@roeck-us.net>
Date:   Tue, 25 Jul 2023 08:10:06 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     James Seo <james@...iv.tech>
Cc:     Jean Delvare <jdelvare@...e.com>,
        Dan Carpenter <dan.carpenter@...aro.org>,
        linux-hwmon@...r.kernel.org, platform-driver-x86@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (hp-wmi-sensors) Initialize pevents in
 hp_wmi_sensors_init()

On Tue, Jul 25, 2023 at 02:48:17AM -0700, James Seo wrote:
> The following warning is given by the Smatch static checker:
> 
>   drivers/hwmon/hp-wmi-sensors.c:1937 hp_wmi_sensors_init()
>   error: uninitialized symbol 'pevents'.
> 
> If there are no instances of the HPBIOS_PlatformEvents WMI object
> available, init_platform_events() never initializes this pointer,
> which may then be passed to hp_wmi_debugfs_init() uninitialized.
> 
> The impact should be limited because hp_wmi_debugfs_init() uses this
> pointer only if the count of HPBIOS_PlatformEvents instances is _not_
> zero, while conversely, it will be uninitialized only if the count of
> such instances _is_ zero. However, passing it uninitialized still
> constitutes a bug.
> 
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/linux-hwmon/f72c129b-8c57-406a-bf41-bd889b65ea0f@moroto.mountain/
> Signed-off-by: James Seo <james@...iv.tech>

Applied.

Thanks,
Guenter

> ---
>  drivers/hwmon/hp-wmi-sensors.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> 
> base-commit: 55612007f16b5d7b1fb83a7b0f5bb686829db7c7
> 
> diff --git a/drivers/hwmon/hp-wmi-sensors.c b/drivers/hwmon/hp-wmi-sensors.c
> index 3a99cc5f44b2..17ae62f88bbf 100644
> --- a/drivers/hwmon/hp-wmi-sensors.c
> +++ b/drivers/hwmon/hp-wmi-sensors.c
> @@ -1913,7 +1913,7 @@ static bool add_event_handler(struct hp_wmi_sensors *state)
>  static int hp_wmi_sensors_init(struct hp_wmi_sensors *state)
>  {
>  	struct hp_wmi_info *connected[HP_WMI_MAX_INSTANCES];
> -	struct hp_wmi_platform_events *pevents;
> +	struct hp_wmi_platform_events *pevents = NULL;
>  	struct device *dev = &state->wdev->dev;
>  	struct hp_wmi_info *info;
>  	struct device *hwdev;