linux-kernel - Re: [PATCH v2 10/12] ASoC: SOF: Intel: hda: make sure DAI widget is set up before IPC

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Message-ID: <b90eff84-b56c-7764-a5bb-f1e07db57cc3@linux.intel.com>
Date:   Thu, 23 Sep 2021 07:58:36 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>,
        Daniel Baluta <daniel.baluta@....nxp.com>, broonie@...nel.org
Cc:     alsa-devel@...a-project.org, kai.vehmanen@...ux.intel.com,
        lgirdwood@...il.com, linux-kernel@...r.kernel.org,
        ranjani.sridharan@...ux.intel.com,
        Guennadi Liakhovetski <guennadi.liakhovetski@...ux.intel.com>,
        daniel.baluta@....com
Subject: Re: [PATCH v2 10/12] ASoC: SOF: Intel: hda: make sure DAI widget is
 set up before IPC


>> +static struct sof_ipc_dai_config *hda_dai_update_config(struct snd_soc_dapm_widget *w,
>> +							int channel)
>>  {
>> +	struct snd_sof_widget *swidget = w->dobj.private;
>>  	struct sof_ipc_dai_config *config;
>>  	struct snd_sof_dai *sof_dai;
>> -	struct sof_ipc_reply reply;
>> -	int ret = 0;
>>  
>> -	list_for_each_entry(sof_dai, &hda_stream->sdev->dai_list, list) {
>> -		if (!sof_dai->cpu_dai_name)
>> -			continue;
>> +	if (!swidget) {
>> +		dev_err(swidget->scomp->dev, "error: No private data for widget %s\n", w->name);
> 
> NULL pointer dereference, just return NULL without the print. The caller
> is printing anyways.

yes good catch, we need a v3 with the fixes suggested by Peter in
https://github.com/thesofproject/linux/pull/3171/ applied.