linux-kernel - Re: [PATCH V3] drm: xlnx: zynqmp_dpsub: Add NULL check in zynqmp_audio

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Message-ID: <b8c4dabc-c9a9-407a-94a1-4a59a67e0440@ideasonboard.com>
Date: Tue, 11 Feb 2025 15:08:27 +0200
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Charles Han <hanchunchao@...pur.com>, laurent.pinchart@...asonboard.com
Cc: dri-devel@...ts.freedesktop.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org, Markus.Elfring@....de,
 maarten.lankhorst@...ux.intel.com, mripard@...nel.org, tzimmermann@...e.de,
 airlied@...il.com, simona@...ll.ch, michal.simek@....com,
 vishal.sagar@....com
Subject: Re: [PATCH V3] drm: xlnx: zynqmp_dpsub: Add NULL check in
 zynqmp_audio_init

Hi,

On 11/02/2025 12:20, Charles Han wrote:
> devm_kasprintf() calls can return null pointers on failure.
> But some return values were not checked in zynqmp_audio_init().
> 
> Add NULL check in zynqmp_audio_init(), avoid referencing null
> pointers in the subsequent code.
> 
> Signed-off-by: Charles Han <hanchunchao@...pur.com>
> ---
>   drivers/gpu/drm/xlnx/zynqmp_dp_audio.c | 4 ++++
>   1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c b/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
> index fa5f0ace6084..f07ff4eb3a6d 100644
> --- a/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
> +++ b/drivers/gpu/drm/xlnx/zynqmp_dp_audio.c
> @@ -323,12 +323,16 @@ int zynqmp_audio_init(struct zynqmp_dpsub *dpsub)
>   
>   	audio->dai_name = devm_kasprintf(dev, GFP_KERNEL,
>   					 "%s-dai", dev_name(dev));
> +	if (!audio->dai_name)
> +		return -ENOMEM;
>   
>   	for (unsigned int i = 0; i < ZYNQMP_NUM_PCMS; ++i) {
>   		audio->link_names[i] = devm_kasprintf(dev, GFP_KERNEL,
>   						      "%s-dp-%u", dev_name(dev), i);
>   		audio->pcm_names[i] = devm_kasprintf(dev, GFP_KERNEL,
>   						     "%s-pcm-%u", dev_name(dev), i);
> +		if (!audio->link_names[i] || !audio->pcm_names[i])
> +			return -ENOMEM;
>   	}
>   
>   	audio->base = devm_platform_ioremap_resource_byname(pdev, "aud");

Thanks, looks good to me. I'll apply with Laurent's RB, which he gave 
for v1.

  Tomi