linux-kernel - Re: [PATCH] backlight: qcom-wled: Add NULL check in the wled

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Message-ID: <1ec61529-09f2-44d8-9324-b94da82158c4@web.de>
Date: Mon, 31 Mar 2025 13:50:35 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Henry Martin <bsdhenrymartin@...il.com>, linux-fbdev@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org
Cc: LKML <linux-kernel@...r.kernel.org>, Daniel Thompson
 <danielt@...nel.org>, Daniel Thompson <daniel@...cstar.com>,
 Helge Deller <deller@....de>, Jingoo Han <jingoohan1@...il.com>,
 Lee Jones <lee@...nel.org>
Subject: Re: [PATCH] backlight: qcom-wled: Add NULL check in the
 wled_configure

> When devm_kasprintf() fails, it returns a NULL pointer. However, this return value is not properly checked in the function wled_configure.
>
> A NULL check should be added after the devm_kasprintf call to prevent potential NULL pointer dereference error.

* Please adhere to word wrapping preferences around 75 characters per text line.

* How do you think about to choose the imperative mood for an improved change description?
  https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.14#n94


…
> +++ b/drivers/video/backlight/qcom-wled.c
> @@ -1406,8 +1406,14 @@ static int wled_configure(struct wled *wled)
>  	wled->ctrl_addr = be32_to_cpu(*prop_addr);
>
>  	rc = of_property_read_string(dev->of_node, "label", &wled->name);
> -	if (rc)
> +	if (rc) {
>  		wled->name = devm_kasprintf(dev, GFP_KERNEL, "%pOFn", dev->of_node);
> +		if (!wled->name) {
> +			dev_err(dev, "Failed to allocate memory for wled name\n");
> +			return -ENOMEM;
> +		}
> +	}
…

An extra error messages for a failed memory allocation may occasionally be omitted.

Regards,
Markus