diff --git a/sound/usb/card.c b/sound/usb/card.c
index 18f56646ce86..3b70175a3000 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -216,11 +216,24 @@ static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 	struct usb_device *dev = chip->dev;
 	struct usb_host_interface *host_iface;
 	struct usb_interface_descriptor *altsd;
+	struct usb_interface *usb_iface;
 	void *control_header;
 	int i, protocol;
 
+	usb_iface = usb_ifnum_to_if(dev, ctrlif);
+	if (!usb_iface) {
+		snd_printk(KERN_ERR "%d:%u : does not exist\n",
+					dev->devnum, ctrlif);
+		return -EINVAL;
+	}
+
 	/* find audiocontrol interface */
-	host_iface = &usb_ifnum_to_if(dev, ctrlif)->altsetting[0];
+	host_iface = &usb_iface->altsetting[0];
+	if (!host_iface) {
+		snd_printk(KERN_ERR "Audio Control interface is not available.");
+		return -EINVAL;
+	}
+
 	control_header = snd_usb_find_csint_desc(host_iface->extra,
 						 host_iface->extralen,
 						 NULL, UAC_HEADER);
@@ -260,8 +273,7 @@ static int snd_usb_create_streams(struct snd_usb_audio *chip, int ctrlif)
 
 	case UAC_VERSION_2: {
 		struct usb_interface_assoc_descriptor *assoc =
-			usb_ifnum_to_if(dev, ctrlif)->intf_assoc;
-
+						usb_iface->intf_assoc;
 		if (!assoc) {
 			/*
 			 * Firmware writers cannot count to three.  So to find