linux-kernel - Re: [PATCH] ASoC: Intel: Skylake: Check the kcontrol against NULL

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Date:   Thu, 10 Dec 2020 16:55:41 +0100
From:   "Gorski, Mateusz" <mateusz.gorski@...ux.intel.com>
To:     Lukasz Majczak <lma@...ihalf.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>
Cc:     Marcin Wojtas <mw@...ihalf.com>,
        Radoslaw Biernacki <rad@...ihalf.com>,
        Alex Levin <levinale@...gle.com>,
        Guenter Roeck <groeck@...gle.com>, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] ASoC: Intel: Skylake: Check the kcontrol against NULL


> There is no check for the kcontrol against NULL and in some cases
> it causes kernel to crash.
>
> Fixes: 2d744ecf2b984 ("ASoC: Intel: Skylake: Automatic DMIC format configuration according to information from NHLT")
> Cc: <stable@...r.kernel.org> # 5.4+
> Signed-off-by: Lukasz Majczak <lma@...ihalf.com>
> ---
>   sound/soc/intel/skylake/skl-topology.c | 14 ++++++++++----
>   1 file changed, 10 insertions(+), 4 deletions(-)
>
> diff --git a/sound/soc/intel/skylake/skl-topology.c b/sound/soc/intel/skylake/skl-topology.c
> index ae466cd592922..c9abbe4ff0ba3 100644
> --- a/sound/soc/intel/skylake/skl-topology.c
> +++ b/sound/soc/intel/skylake/skl-topology.c
> @@ -3618,12 +3618,18 @@ static void skl_tplg_complete(struct snd_soc_component *component)
>   	int i;
>   
>   	list_for_each_entry(dobj, &component->dobj_list, list) {
> -		struct snd_kcontrol *kcontrol = dobj->control.kcontrol;
> -		struct soc_enum *se =
> -			(struct soc_enum *)kcontrol->private_value;
> -		char **texts = dobj->control.dtexts;
> +		struct snd_kcontrol *kcontrol;
> +		struct soc_enum *se;
> +		char **texts;
>   		char chan_text[4];
>   
> +		kcontrol = dobj->control.kcontrol;
> +		if(!kcontrol)
> +			continue;
> +
> +		se = (struct soc_enum *)kcontrol->private_value;
> +		texts = dobj->control.dtexts;
> +
>   		if (dobj->type != SND_SOC_DOBJ_ENUM ||
>   		    dobj->control.kcontrol->put !=
>   		    skl_tplg_multi_config_set_dmic)
>
> base-commit: 69fe63aa100220c8fd1f451dd54dd0895df1441d


Thanks for pointing out and fixing this. This check was obviously 
missing there. I did a quick verification on few of our platforms, 
encountered no issues, so:

     Reviewed-by: Mateusz Gorski <mateusz.gorski@...ux.intel.com>


Also, could you please:

- describe the affected configuration (used machine driver or audio card 
name, device name),
- share full dmesg logs from one of said crashes,
- copy the output of "amixer -c0 controls" command executed on affected 
device.

These would be useful information for us to further improve our 
validation and help us with debugging.


Thanks,

Mateusz