diff --git a/drivers/firewire/nosy.c b/drivers/firewire/nosy.c
index ac85e03e88e1..f3784c054dd6 100644
--- a/drivers/firewire/nosy.c
+++ b/drivers/firewire/nosy.c
@@ -161,10 +161,12 @@ packet_buffer_get(struct client *client, char __user *data, size_t user_length)
 	if (atomic_read(&buffer->size) == 0)
 		return -ENODEV;
 
-	/* FIXME: Check length <= user_length. */
+	length = buffer->head->length;
+
+	if (length > user_length)
+		return 0;
 
 	end = buffer->data + buffer->capacity;
-	length = buffer->head->length;
 
 	if (&buffer->head->data[length] < end) {
 		if (copy_to_user(data, buffer->head->data, length))