linux-kernel - Re: [PATCH v2 1/2] ASoC: Intel: Skylake: skl-topology: Fix OOPs ib skl_tplg

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Date:   Thu, 21 Jan 2021 19:46:23 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Cezary Rojewski <cezary.rojewski@...el.com>,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>,
        Liam Girdwood <liam.r.girdwood@...ux.intel.com>,
        Jie Yang <yang.jie@...ux.intel.com>,
        Mark Brown <broonie@...nel.org>,
        Jaroslav Kysela <perex@...ex.cz>,
        Takashi Iwai <tiwai@...e.com>,
        Mateusz Gorski <mateusz.gorski@...ux.intel.com>,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Lukasz Majczak <lma@...ihalf.com>
Subject: Re: [PATCH v2 1/2] ASoC: Intel: Skylake: skl-topology: Fix OOPs ib
 skl_tplg_complete

On Thu, Jan 21, 2021 at 06:16:43PM +0100, Ricardo Ribalda wrote:
> If dobj->control is not initialized we end up in an OOPs during
> skl_tplg_complete:
> 
> [   26.553358] BUG: kernel NULL pointer dereference, address:
> 0000000000000078
> [   26.561151] #PF: supervisor read access in kernel mode
> [   26.566897] #PF: error_code(0x0000) - not-present page
> [   26.572642] PGD 0 P4D 0
> [   26.575479] Oops: 0000 [#1] PREEMPT SMP PTI
> [   26.580158] CPU: 2 PID: 2082 Comm: udevd Tainted: G         C
> 5.4.81 #4
> [   26.588232] Hardware name: HP Soraka/Soraka, BIOS
> Google_Soraka.10431.106.0 12/03/2019
> [   26.597082] RIP: 0010:skl_tplg_complete+0x70/0x144 [snd_soc_skl]

Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> Fixes: 2d744ecf2b98 ("ASoC: Intel: Skylake: Automatic DMIC format configuration according to information from NHL")
> Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
> ---
>  sound/soc/intel/skylake/skl-topology.c | 13 +++++++------
>  1 file changed, 7 insertions(+), 6 deletions(-)
> 
> diff --git a/sound/soc/intel/skylake/skl-topology.c b/sound/soc/intel/skylake/skl-topology.c
> index ae466cd59292..1ef30ca45410 100644
> --- a/sound/soc/intel/skylake/skl-topology.c
> +++ b/sound/soc/intel/skylake/skl-topology.c
> @@ -3619,15 +3619,16 @@ static void skl_tplg_complete(struct snd_soc_component *component)
>  
>  	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 soc_enum *se;

> +		char **texts;

A nit-pick: Can we place this after below line?

>  		char chan_text[4];
>  
> -		if (dobj->type != SND_SOC_DOBJ_ENUM ||
> -		    dobj->control.kcontrol->put !=
> -		    skl_tplg_multi_config_set_dmic)
> +		if (dobj->type != SND_SOC_DOBJ_ENUM || !kcontrol ||
> +		    kcontrol->put != skl_tplg_multi_config_set_dmic)
>  			continue;
> +
> +		se = (struct soc_enum *)kcontrol->private_value;
> +		texts = dobj->control.dtexts;
>  		sprintf(chan_text, "c%d", mach->mach_params.dmic_num);
>  
>  		for (i = 0; i < se->items; i++) {
> -- 
> 2.30.0.296.g2bfb1c46d8-goog
> 

-- 
With Best Regards,
Andy Shevchenko