diff --git a/sound/usb/midi2.c b/sound/usb/midi2.c
index a27e244650c8..1ec177fe284e 100644
--- a/sound/usb/midi2.c
+++ b/sound/usb/midi2.c
@@ -265,7 +265,7 @@ static void free_midi_urbs(struct snd_usb_midi2_endpoint *ep)
 
 	if (!ep)
 		return;
-	for (i = 0; i < ep->num_urbs; ++i) {
+	for (i = 0; i < NUM_URBS; ++i) {
 		ctx = &ep->urbs[i];
 		if (!ctx->urb)
 			break;
@@ -279,6 +279,7 @@ static void free_midi_urbs(struct snd_usb_midi2_endpoint *ep)
 }
 
 /* allocate URBs for an EP */
+/* the callers should handle allocation errors via free_midi_urbs() */
 static int alloc_midi_urbs(struct snd_usb_midi2_endpoint *ep)
 {
 	struct snd_usb_midi2_urb *ctx;
@@ -351,8 +352,10 @@ static int snd_usb_midi_v2_open(struct snd_ump_endpoint *ump, int dir)
 		return -EIO;
 	if (ep->direction == STR_OUT) {
 		err = alloc_midi_urbs(ep);
-		if (err)
+		if (err) {
+			free_midi_urbs(ep);
 			return err;
+		}
 	}
 	return 0;
 }