linux-kernel - RE: [PATCH] ASoC: amd: Add error checking to probe function

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Date:   Tue, 21 Nov 2017 04:47:13 +0000
From:   "Deucher, Alexander" <Alexander.Deucher@....com>
To:     'Guenter Roeck' <linux@...ck-us.net>,
        Liam Girdwood <lgirdwood@...il.com>,
        "Mukunda, Vijendar" <Vijendar.Mukunda@....com>,
        "Agrawal, Akshu" <Akshu.Agrawal@....com>
CC:     Mark Brown <broonie@...nel.org>, Jaroslav Kysela <perex@...ex.cz>,
        "Takashi Iwai" <tiwai@...e.com>,
        "alsa-devel@...a-project.org" <alsa-devel@...a-project.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Dominik Behr <dbehr@...omium.org>,
        "Daniel Kurtz" <djkurtz@...omium.org>
Subject: RE: [PATCH] ASoC: amd: Add error checking to probe function

> -----Original Message-----
> From: Guenter Roeck [mailto:groeck7@...il.com] On Behalf Of Guenter
> Roeck
> Sent: Monday, November 20, 2017 11:28 PM
> To: Liam Girdwood
> Cc: Mark Brown; Jaroslav Kysela; Takashi Iwai; alsa-devel@...a-project.org;
> linux-kernel@...r.kernel.org; Guenter Roeck; Deucher, Alexander; Dominik
> Behr; Daniel Kurtz
> Subject: [PATCH] ASoC: amd: Add error checking to probe function
> 
> The acp_audio_dma does not perform sufficient error checking in its probe
> function. This can result in crashes if a critical error path is
> encountered.
> 
> Fixes: 7c31335a03b6a ("ASoC: AMD: add AMD ASoC ACP 2.x DMA driver")
> Cc: Alex Deucher <alexander.deucher@....com>
> Cc: Dominik Behr <dbehr@...omium.org>
> Cc: Daniel Kurtz <djkurtz@...omium.org>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>
> ---
> I didn't add an error check to acp_init() since I was not sure if
> its return value is ignored on purpose.

Vijendar, Akshu can you comment?

The patch looks good to me.
Reviewed-by: Alex Deucher <alexander.deucher@....com>

> 
>  sound/soc/amd/acp-pcm-dma.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-
> dma.c
> index 9f521a55d610..b5e41df6bb3a 100644
> --- a/sound/soc/amd/acp-pcm-dma.c
> +++ b/sound/soc/amd/acp-pcm-dma.c
> @@ -1051,6 +1051,11 @@ static int acp_audio_probe(struct platform_device
> *pdev)
>  	struct resource *res;
>  	const u32 *pdata = pdev->dev.platform_data;
> 
> +	if (!pdata) {
> +		dev_err(&pdev->dev, "Missing platform data\n");
> +		return -ENODEV;
> +	}
> +
>  	audio_drv_data = devm_kzalloc(&pdev->dev, sizeof(struct
> audio_drv_data),
>  					GFP_KERNEL);
>  	if (audio_drv_data == NULL)
> @@ -1058,6 +1063,8 @@ static int acp_audio_probe(struct platform_device
> *pdev)
> 
>  	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>  	audio_drv_data->acp_mmio = devm_ioremap_resource(&pdev-
> >dev, res);
> +	if (IS_ERR(audio_drv_data->acp_mmio))
> +		return PTR_ERR(audio_drv_data->acp_mmio);
> 
>  	/* The following members gets populated in device 'open'
>  	 * function. Till then interrupts are disabled in 'acp_init'
> --
> 2.7.4