ASoC: SOF: Intel: hda-dai: Ensure DAI widget is valid during params

[ Upstream commit 569922b82ca660f8b24e705f6cf674e6b1f99cc7 ]

Each cpu DAI should associate with a widget. However, the topology might
not create the right number of DAI widgets for aggregated amps. And it
will cause NULL pointer deference.
Check that the DAI widget associated with the CPU DAI is valid to prevent
NULL pointer deference due to missing DAI widgets in topologies with
aggregated amps.

Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@linux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@linux.intel.com>
Reviewed-by: Liam Girdwood <liam.r.girdwood@intel.com>
Link: https://patch.msgid.link/20241203104853.56956-1-yung-chuan.liao@linux.intel.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

sound/soc/sof/intel/hda-dai.c

@@ -503,6 +503,12 @@ int sdw_hda_dai_hw_params(struct snd_pcm_substream *substream,
 	int ret;
 	int i;
 
+	if (!w) {
+		dev_err(cpu_dai->dev, "%s widget not found, check amp link num in the topology\n",
+			cpu_dai->name);
+		return -EINVAL;
+	}
+
 	ops = hda_dai_get_ops(substream, cpu_dai);
 	if (!ops) {
 		dev_err(cpu_dai->dev, "DAI widget ops not set\n");
@@ -582,6 +588,12 @@ int sdw_hda_dai_hw_params(struct snd_pcm_substream *substream,
 	 */
 	for_each_rtd_cpu_dais(rtd, i, dai) {
 		w = snd_soc_dai_get_widget(dai, substream->stream);
+		if (!w) {
+			dev_err(cpu_dai->dev,
+				"%s widget not found, check amp link num in the topology\n",
+				dai->name);
+			return -EINVAL;
+		}
 		ipc4_copier = widget_to_copier(w);
 		memcpy(&ipc4_copier->dma_config_tlv[cpu_dai_id], dma_config_tlv,
 		       sizeof(*dma_config_tlv));

sound/soc/sof/intel/hda.c

@@ -63,6 +63,11 @@ static int sdw_params_stream(struct device *dev,
 	struct snd_soc_dapm_widget *w = snd_soc_dai_get_widget(d, params_data->substream->stream);
 	struct snd_sof_dai_config_data data = { 0 };
 
+	if (!w) {
+		dev_err(dev, "%s widget not found, check amp link num in the topology\n",
+			d->name);
+		return -EINVAL;
+	}
 	data.dai_index = (params_data->link_id << 8) | d->id;
 	data.dai_data = params_data->alh_stream_id;
 	data.dai_node_id = data.dai_data;