linux-kernel - Re: [PATCH] platform/x86: ideapad-laptop: fix a NULL pointer dereference

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Date:   Fri, 30 Apr 2021 16:45:02 +0800
From:   Ike Panhc <ike.pan@...onical.com>
To:     Qiu Wenbo <qiuwenbo@...inos.com.cn>, hdegoede@...hat.com,
        mgross@...ux.intel.com
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: ideapad-laptop: fix a NULL pointer
 dereference

On 4/28/21 1:06 PM, Qiu Wenbo wrote:
> The third parameter of dytc_cql_command should not be NULL since it will
> be dereferenced immediately.
> 
> Signed-off-by: Qiu Wenbo <qiuwenbo@...inos.com.cn>

Fixes: ff36b0d953dc4 ("platform/x86: ideapad-laptop: rework and create new ACPI helpers")
Acked-by: Ike Panhc <ike.pan@...onical.com>

> ---
>  drivers/platform/x86/ideapad-laptop.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/platform/x86/ideapad-laptop.c b/drivers/platform/x86/ideapad-laptop.c
> index 6cb5ad4be231..8f871151f0cc 100644
> --- a/drivers/platform/x86/ideapad-laptop.c
> +++ b/drivers/platform/x86/ideapad-laptop.c
> @@ -809,6 +809,7 @@ static int dytc_profile_set(struct platform_profile_handler *pprof,
>  {
>  	struct ideapad_dytc_priv *dytc = container_of(pprof, struct ideapad_dytc_priv, pprof);
>  	struct ideapad_private *priv = dytc->priv;
> +	unsigned long output;
>  	int err;
>  
>  	err = mutex_lock_interruptible(&dytc->mutex);
> @@ -829,7 +830,7 @@ static int dytc_profile_set(struct platform_profile_handler *pprof,
>  
>  		/* Determine if we are in CQL mode. This alters the commands we do */
>  		err = dytc_cql_command(priv, DYTC_SET_COMMAND(DYTC_FUNCTION_MMC, perfmode, 1),
> -				       NULL);
> +				       &output);
>  		if (err)
>  			goto unlock;
>  	}
>