diff --git a/sound/firewire/motu/motu-hwdep.c b/sound/firewire/motu/motu-hwdep.c
index 981c19430cb0..6675b23aad69 100644
--- a/sound/firewire/motu/motu-hwdep.c
+++ b/sound/firewire/motu/motu-hwdep.c
@@ -83,10 +83,11 @@ static long hwdep_read(struct snd_hwdep *hwdep, char __user *buf, long count,
 		event.motu_register_dsp_change.type = SNDRV_FIREWIRE_EVENT_MOTU_REGISTER_DSP_CHANGE;
 		event.motu_register_dsp_change.count =
 			(consumed - sizeof(event.motu_register_dsp_change)) / 4;
-		if (copy_to_user(buf, &event, sizeof(event.motu_register_dsp_change)))
+		if (copy_to_user(buf, &event,
+				 min_t(long, count, sizeof(event.motu_register_dsp_change))))
 			return -EFAULT;
 
-		count = consumed;
+		count = min_t(long, count, consumed);
 	} else {
 		spin_unlock_irq(&motu->lock);