linux-kernel - Re: [PATCH] backlight: pcf50633: pdata may be a null pointer, null pointer dereference cause crash

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Date:   Tue, 2 Feb 2021 08:28:32 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Wenjia Zhao <driverfuzzing@...il.com>
Cc:     Daniel Thompson <daniel.thompson@...aro.org>,
        Jingoo Han <jingoohan1@...il.com>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] backlight: pcf50633: pdata may be a null pointer, null
 pointer dereference cause crash

On Mon, 01 Feb 2021, Wenjia Zhao wrote:

Please provide a suitable commit messages.

Describe the problem.
Describe the issue was found.
Describe the solution.  

> Signed-off-by: Wenjia Zhao <driverfuzzing@...il.com>
> ---
>  drivers/video/backlight/pcf50633-backlight.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/video/backlight/pcf50633-backlight.c b/drivers/video/backlight/pcf50633-backlight.c
> index 540dd338..43267af 100644
> --- a/drivers/video/backlight/pcf50633-backlight.c
> +++ b/drivers/video/backlight/pcf50633-backlight.c
> @@ -127,7 +127,8 @@ static int pcf50633_bl_probe(struct platform_device *pdev)
>  
>  	platform_set_drvdata(pdev, pcf_bl);
>  
> -	pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time);
> +  if (pdata)
> +    pcf50633_reg_write(pcf_bl->pcf, PCF50633_REG_LEDDIM, pdata->ramp_time);

A tab should be 8 chars in Linux.

>  	/*
>  	 * Should be different from bl_props.brightness, so we do not exit

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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