Re: [PATCH v3 1/4] backlight: qcom-wled: Fix NULL pointer dereference in PM callbacks

[Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>]

On 9/14/26 8:14 PM, David Heidelberg via B4 Relay wrote:
> From: David Heidelberg <david@ixit.cz>
> 
> wled_probe() doesn't set the driver data for the platform device.
> As a result, dev_get_drvdata() in wled_remove() will return NULL,
> leading to a NULL pointer dereference afterward.
> 
> Set the platform device driver data in wled_probe().
> 
> Cc: stable@vger.kernel.org
> Fixes: feeab87b3072 ("backlight: qcom-wled: Add support for short circuit handling")
> Signed-off-by: David Heidelberg <david@ixit.cz>
> ---
>  drivers/video/backlight/qcom-wled.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/video/backlight/qcom-wled.c b/drivers/video/backlight/qcom-wled.c
> index 650dd95f06ef5..a76158a298335 100644
> --- a/drivers/video/backlight/qcom-wled.c
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -1747,16 +1747,17 @@ static int wled_probe(struct platform_device *pdev)
>  
>  	memset(&props, 0, sizeof(struct backlight_properties));
>  	props.type = BACKLIGHT_RAW;
>  	props.brightness = val;
>  	props.max_brightness = wled->max_brightness;
>  	bl = devm_backlight_device_register(&pdev->dev, wled->name,
>  					    &pdev->dev, wled,
>  					    &wled_ops, &props);
> +	platform_set_drvdata(pdev, bl);

This does make the pointer non-null, but it stores the wrong object

Konrad

>  	return PTR_ERR_OR_ZERO(bl);
>  };
>  
>  static void wled_remove(struct platform_device *pdev)
>  {
>  	struct wled *wled = platform_get_drvdata(pdev);
>  
>  	mutex_destroy(&wled->lock);
>