linux-kernel - Re: [PATCH V2] drm: bridge/dw-hdmi-ahb-audio: use strscpy() is more robust and safer

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Date:   Tue, 20 Sep 2022 10:16:59 +0200
From:   Neil Armstrong <neil.armstrong@...aro.org>
To:     cgel.zte@...il.com, andrzej.hajda@...el.com
Cc:     robert.foss@...aro.org, linux-kernel@...r.kernel.org,
        Minghao Chi <chi.minghao@....com.cn>,
        dri-devel@...ts.freedesktop.org, Laurent.pinchart@...asonboard.com
Subject: Re: [PATCH V2] drm: bridge/dw-hdmi-ahb-audio: use strscpy() is more
 robust and safer

Hi,

On 20/09/2022 08:16, cgel.zte@...il.com wrote:
> From: Minghao Chi <chi.minghao@....com.cn>
> 
> The implementation of strscpy() is more robust and safer.
> 
> That's now the recommended way to copy NUL terminated strings.
> 
> Signed-off-by: Minghao Chi <chi.minghao@....com.cn>
> ---
> v1->v2
> using DRIVER_NAME instead of "DW-HDMI".
>   drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
> index 7d2ed0ed2fe2..8cb6177f976d 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi-ahb-audio.c
> @@ -542,8 +542,8 @@ static int snd_dw_hdmi_probe(struct platform_device *pdev)
>   	if (ret < 0)
>   		return ret;
>   
> -	strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver));
> -	strlcpy(card->shortname, "DW-HDMI", sizeof(card->shortname));
> +	strscpy(card->driver, DRIVER_NAME, sizeof(card->driver));
> +	strscpy(card->shortname, DRIVER_NAME, sizeof(card->shortname));

OH, I did misread the first patch, and it was in fact ok... I'll apply v1 instead !

Thanks for fixing, but sorry for my wrong review...

>   	snprintf(card->longname, sizeof(card->longname),
>   		 "%s rev 0x%02x, irq %d", card->shortname, revision,
>   		 data->irq);
> @@ -561,7 +561,7 @@ static int snd_dw_hdmi_probe(struct platform_device *pdev)
>   
>   	dw->pcm = pcm;
>   	pcm->private_data = dw;
> -	strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
> +	strscpy(pcm->name, DRIVER_NAME, sizeof(pcm->name));
>   	snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_dw_hdmi_ops);
>   
>   	/*

Neil