diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index edff302cac23..e24572fd6e30 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -1647,6 +1647,7 @@ static int parse_audio_mixer_unit(struct mixer_build *state, int unitid,
 	int pin, ich, err;
 
 	if (desc->bLength < 11 || !(input_pins = desc->bNrInPins) ||
+	    desc->bLength < sizeof(*desc) + desc->bNrInPins ||
 	    !(num_outs = uac_mixer_unit_bNrChannels(desc))) {
 		usb_audio_err(state->chip,
 			      "invalid MIXER UNIT descriptor %d\n",