linux-kernel - Re: [PATCH] Input: psmouse - fix psmouse detect function is a NULL pointer

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Message-ID: <YLcTilSGgW6jMKEy@google.com>
Date:   Tue, 1 Jun 2021 22:13:46 -0700
From:   Dmitry Torokhov <dmitry.torokhov@...il.com>
To:     Qiang Ma <maqianga@...ontech.com>
Cc:     wangxiongfeng2@...wei.com, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Input: psmouse - fix psmouse detect function is a NULL
 pointer

Hi Qiang,

On Wed, May 19, 2021 at 11:23:35AM +0800, Qiang Ma wrote:
> Add a check for psmouse_do_detect(), when the detect is NULL pointer,
> returning false, avoiding this possible NULL pointer exception.
> 
> Signed-off-by: Qiang Ma <maqianga@...ontech.com>
> ---
>  drivers/input/mouse/psmouse-base.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/input/mouse/psmouse-base.c b/drivers/input/mouse/psmouse-base.c
> index 0b4a3039f312..86b095728587 100644
> --- a/drivers/input/mouse/psmouse-base.c
> +++ b/drivers/input/mouse/psmouse-base.c
> @@ -1006,6 +1006,9 @@ static bool psmouse_do_detect(int (*detect)(struct psmouse *, bool),
>  	if (set_properties)
>  		psmouse_apply_defaults(psmouse);
>  
> +	if (!detect)
> +		return false;

There are no protocols that do not define detect() method, so this
condition is not possible.

> +
>  	return detect(psmouse, set_properties) == 0;
>  }
>  

Thanks.

-- 
Dmitry