ASoC: SOF: ipc4-control: Validate notification payload size

Validate MODULE_NOTIFICATION payload length before reading
bytes/channel data in control update handling.

Fixes: 2a28b52 ("ASoC: SOF: ipc4-control: Add support for generic bytes control")
Signed-off-by: Peter Ujfalusi <peter.ujfalusi@linux.intel.com>

Author: ujfalusi

sound/soc/sof/ipc4-control.c

@@ -875,6 +875,16 @@ static void sof_ipc4_control_update(struct snd_sof_dev *sdev, void *ipc_message)
 		 */
 		if (type == SND_SOC_TPLG_TYPE_BYTES) {
 			struct sof_abi_hdr *data = cdata->data;
+			size_t source_size = struct_size(msg_data, data, msg_data->num_elems);
+
+			if (source_size > ndata->event_data_size) {
+				dev_warn(sdev->dev,
+					 "%s: invalid bytes notification size for %s (%zu, %u)\n",
+					 __func__, scontrol->name, source_size,
+					 ndata->event_data_size);
+				scontrol->comp_data_dirty = true;
+				goto notify;
+			}
 
 			if (msg_data->num_elems > scontrol->max_size - sizeof(*data)) {
 				dev_warn(sdev->dev,
@@ -887,6 +897,17 @@ static void sof_ipc4_control_update(struct snd_sof_dev *sdev, void *ipc_message)
 				scontrol->size = sizeof(*cdata) + sizeof(*data) + data->size;
 			}
 		} else {
+			size_t source_size = struct_size(msg_data, chanv, msg_data->num_elems);
+
+			if (source_size > ndata->event_data_size) {
+				dev_warn(sdev->dev,
+					 "%s: invalid channel notification size for %s (%zu, %u)\n",
+					 __func__, scontrol->name, source_size,
+					 ndata->event_data_size);
+				scontrol->comp_data_dirty = true;
+				goto notify;
+			}
+
 			for (i = 0; i < msg_data->num_elems; i++) {
 				u32 channel = msg_data->chanv[i].channel;
 
@@ -914,6 +935,8 @@ static void sof_ipc4_control_update(struct snd_sof_dev *sdev, void *ipc_message)
 		scontrol->comp_data_dirty = true;
 	}
 
+notify:
+
 	/*
 	 * Look up the ALSA kcontrol of the scontrol to be able to send a
 	 * notification to user space