diff --git a/sound/usb/format.c b/sound/usb/format.c
index 2cc3b92f1fba..cb23dd1670b3 100644
--- a/sound/usb/format.c
+++ b/sound/usb/format.c
@@ -90,6 +90,11 @@ static u64 parse_audio_format_i_type(struct snd_usb_audio *chip,
 			sample_bytes = SUBSLOTSIZE_24_BIT;
 			break;
 		}
+
+		default:
+			usb_audio_err(chip, "%u:%d : Invalid wMaxPacketSize\n",
+				      fp->iface, fp->altsetting);
+			return pcm_formats;
 		}
 		format = 1 << format;
 		break;
diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index b9d9d2e99c78..70dfdd22102e 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1632,6 +1632,10 @@ static int parse_audio_feature_unit(struct mixer_build *state, int unitid,
 				break;
 			}
 			break;
+
+		default:
+			usb_audio_err(state->chip, "Invalid unit %u\n", unitid);
+			return -EINVAL;
 		}
 	}
 
diff --git a/sound/usb/usb_audio_qmi_svc.c b/sound/usb/usb_audio_qmi_svc.c
index 14ea2239fe11..28c5a3736a9c 100644
--- a/sound/usb/usb_audio_qmi_svc.c
+++ b/sound/usb/usb_audio_qmi_svc.c
@@ -497,6 +497,12 @@ static int prepare_qmi_response(struct snd_usb_substream *subs,
 			resp->usb_audio_subslot_size = SUBSLOTSIZE_24_BIT;
 			break;
 		}
+
+		default:
+			pr_err("%d: %u: Invalid wMaxPacketSize\n",
+				subs->interface, subs->altset_idx);
+			ret = -EINVAL;
+			goto err;
 		}
 		resp->usb_audio_subslot_size_valid = 1;
 	} else {