linux-kernel - Re: [PATCH] ASoC: SOF: Intel: hda-stream: Move three variable assignments behind condition checks in hda_dsp_iccmax_stream_hw

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Message-ID: <fbdee94e-b731-0471-e18f-b334ab0db7f5@linux.intel.com>
Date:   Wed, 19 Apr 2023 14:03:18 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Markus Elfring <Markus.Elfring@....de>,
        kernel-janitors@...r.kernel.org, alsa-devel@...a-project.org,
        sound-open-firmware@...a-project.org,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....com>,
        Jaroslav Kysela <perex@...ex.cz>,
        Kai Vehmanen <kai.vehmanen@...ux.intel.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Peter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Rander Wang <rander.wang@...el.com>,
        Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>,
        Takashi Iwai <tiwai@...e.com>
Cc:     cocci@...ia.fr, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ASoC: SOF: Intel: hda-stream: Move three variable
 assignments behind condition checks in hda_dsp_iccmax_stream_hw_params()



On 4/19/23 13:54, Markus Elfring wrote:
> Date: Wed, 19 Apr 2023 20:42:19 +0200
> 
> The address of a data structure member was determined before
> a corresponding null pointer check in the implementation of
> the function “hda_dsp_iccmax_stream_hw_params”.
> 
> Thus avoid the risk for undefined behaviour by moving the assignment
> for three local variables behind some condition checks.
> 
> This issue was detected by using the Coccinelle software.
> 
> Fixes: 7d88b9608142f95ccdd3dfb190da4a5faddb1cc7 ("ASoC: SOF: Intel: hdac_ext_stream: consistent prefixes for variables/members")
> Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>

Yes indeed, for some reason this was fixed in
hda_dsp_stream_hw_params() but not in the
hda_dsp_iccmax_stream_hw_params() variant.

Could we however use the same code as in hda_dsp_stream_hw_params() for
consistency?

	if (!hext_stream) {
		dev_err(sdev->dev, "error: no stream available\n");
		return -ENODEV;
	}

	if (!dmab) {
		dev_err(sdev->dev, "error: no dma buffer allocated!\n");
		return -ENODEV;
	}

	hstream = &hext_stream->hstream;
	sd_offset = SOF_STREAM_SD_OFFSET(hstream);
	mask = BIT(hstream->index);

Thanks!

> ---
>  sound/soc/sof/intel/hda-stream.c | 11 ++++++++---
>  1 file changed, 8 insertions(+), 3 deletions(-)
> 
> diff --git a/sound/soc/sof/intel/hda-stream.c b/sound/soc/sof/intel/hda-stream.c
> index 79d818e6a0fa..9c44127014fc 100644
> --- a/sound/soc/sof/intel/hda-stream.c
> +++ b/sound/soc/sof/intel/hda-stream.c
> @@ -407,10 +407,10 @@ int hda_dsp_iccmax_stream_hw_params(struct snd_sof_dev *sdev, struct hdac_ext_st
>  				    struct snd_dma_buffer *dmab,
>  				    struct snd_pcm_hw_params *params)
>  {
> -	struct hdac_stream *hstream = &hext_stream->hstream;
> -	int sd_offset = SOF_STREAM_SD_OFFSET(hstream);
> +	struct hdac_stream *hstream;
> +	int sd_offset;
>  	int ret;
> -	u32 mask = 0x1 << hstream->index;
> +	u32 mask;
> 
>  	if (!hext_stream) {
>  		dev_err(sdev->dev, "error: no stream available\n");
> @@ -422,9 +422,12 @@ int hda_dsp_iccmax_stream_hw_params(struct snd_sof_dev *sdev, struct hdac_ext_st
>  		return -ENODEV;
>  	}
> 
> +	hstream = &hext_stream->hstream;
>  	if (hstream->posbuf)
>  		*hstream->posbuf = 0;
> 
> +	sd_offset = SOF_STREAM_SD_OFFSET(hstream);
> +
>  	/* reset BDL address */
>  	snd_sof_dsp_write(sdev, HDA_DSP_HDA_BAR,
>  			  sd_offset + SOF_HDA_ADSP_REG_SD_BDLPL,
> @@ -459,6 +462,8 @@ int hda_dsp_iccmax_stream_hw_params(struct snd_sof_dev *sdev, struct hdac_ext_st
>  				sd_offset + SOF_HDA_ADSP_REG_SD_LVI,
>  				0xffff, (hstream->frags - 1));
> 
> +	mask = 0x1 << hstream->index;
> +
>  	/* decouple host and link DMA, enable DSP features */
>  	snd_sof_dsp_update_bits(sdev, HDA_DSP_PP_BAR, SOF_HDA_REG_PP_PPCTL,
>  				mask, mask);
> --
> 2.40.0
>