diff --git a/sound/usb/mixer.c b/sound/usb/mixer.c
index 7e1c6c2dc99e80096c006bf3861d8a01cd3a9d30..cb3d59c1e181e97a08cfbb90fd0bf0006c87dff9 100644
--- a/sound/usb/mixer.c
+++ b/sound/usb/mixer.c
@@ -759,6 +759,8 @@ static int uac_mixer_unit_get_channels(struct mixer_build *state,
 		return -EINVAL;
 	if (!desc->bNrInPins)
 		return -EINVAL;
+	if (desc->bLength < sizeof(*desc) + desc->bNrInPins)
+		return -EINVAL;
 
 	switch (state->mixer->protocol) {
 	case UAC_VERSION_1: