diff --git a/spa/include/spa/param/audio/dsd-utils.h b/spa/include/spa/param/audio/dsd-utils.h
index 2d99e79f2..2dab7cc19 100644
--- a/spa/include/spa/param/audio/dsd-utils.h
+++ b/spa/include/spa/param/audio/dsd-utils.h
@@ -33,6 +33,8 @@ spa_format_audio_dsd_parse(const struct spa_pod *format, struct spa_audio_info_d
 {
 	struct spa_pod *position = NULL;
 	int res;
+	uint32_t max_position = SPA_N_ELEMENTS(info->position);
+
 	info->flags = 0;
 	res = spa_pod_parse_object(format,
 			SPA_TYPE_OBJECT_Format, NULL,
@@ -41,10 +43,13 @@ spa_format_audio_dsd_parse(const struct spa_pod *format, struct spa_audio_info_d
 			SPA_FORMAT_AUDIO_rate,		SPA_POD_OPT_Int(&info->rate),
 			SPA_FORMAT_AUDIO_channels,	SPA_POD_OPT_Int(&info->channels),
 			SPA_FORMAT_AUDIO_position,	SPA_POD_OPT_Pod(&position));
+	if (info->channels > max_position)
+		return -ECHRNG;
 	if (position == NULL ||
-	    !spa_pod_copy_array(position, SPA_TYPE_Id, info->position, SPA_N_ELEMENTS(info->position)))
+	    spa_pod_copy_array(position, SPA_TYPE_Id, info->position, max_position) != info->channels) {
 		SPA_FLAG_SET(info->flags, SPA_AUDIO_FLAG_UNPOSITIONED);
-
+		spa_memzero(info->position, max_position * sizeof(info->position[0]));
+	}
 	return res;
 }
 
diff --git a/spa/include/spa/param/audio/raw-utils.h b/spa/include/spa/param/audio/raw-utils.h
index da1ec7317..3f81b4a92 100644
--- a/spa/include/spa/param/audio/raw-utils.h
+++ b/spa/include/spa/param/audio/raw-utils.h
@@ -48,8 +48,10 @@ spa_format_audio_raw_ext_parse(const struct spa_pod *format, struct spa_audio_in
 	if (info->channels > max_position)
 		return -ECHRNG;
 	if (position == NULL ||
-	    spa_pod_copy_array(position, SPA_TYPE_Id, info->position, max_position) != info->channels)
+	    spa_pod_copy_array(position, SPA_TYPE_Id, info->position, max_position) != info->channels) {
 		SPA_FLAG_SET(info->flags, SPA_AUDIO_FLAG_UNPOSITIONED);
+		spa_memzero(info->position, max_position * sizeof(info->position[0]));
+	}
 
 	return res;
 }