diff --git a/sound/usb/fcp.c b/sound/usb/fcp.c
index 6f5dcd35e1d4..2bf572c6fdc4 100644
--- a/sound/usb/fcp.c
+++ b/sound/usb/fcp.c
@@ -129,6 +129,10 @@ struct fcp_data {
 
 #define FCP_SEGMENT_APP_GOLD 0
 
+#define FCP_MAX_METER_MAP_SIZE \
+	(sizeof_field(struct snd_ctl_elem_value, value.integer.value) / \
+	 sizeof(long))
+
 /* Forward declarations */
 static int fcp_init(struct usb_mixer_interface *mixer,
 		    void *step0_resp, void *step2_resp);
@@ -410,6 +414,9 @@ static int fcp_meter_ctl_get(struct snd_kcontrol *kctl,
 	if (err < 0)
 		return err;
 
+	if (WARN_ON_ONCE(elem->channels > FCP_MAX_METER_MAP_SIZE))
+		return -EINVAL;
+
 	/* copy & translate from resp[] using meter_level_map[] */
 	for (i = 0; i < elem->channels; i++) {
 		int idx = private->meter_level_map[i];
@@ -636,7 +643,8 @@ static int fcp_ioctl_set_meter_map(struct usb_mixer_interface *mixer,
 	}
 
 	/* Validate the map size */
-	if (map.map_size < 1 || map.map_size > 255 ||
+	if (map.map_size < 1 ||
+	    map.map_size > FCP_MAX_METER_MAP_SIZE ||
 	    map.meter_slots < 1 || map.meter_slots > 255)
 		return -EINVAL;