diff --git a/drivers/net/mlx4/port.c b/drivers/net/mlx4/port.c
index 606aa58..8674ad5 100644
--- a/drivers/net/mlx4/port.c
+++ b/drivers/net/mlx4/port.c
@@ -111,6 +111,12 @@
 			goto out;
 		}
 	}
+
+	if (free < 0) {
+		err = -ENOMEM;
+		goto out;
+	}
+
 	mlx4_dbg(dev, "Free MAC index is %d\n", free);
 
 	if (table->total == table->max) {
@@ -205,6 +211,11 @@
 		}
 	}
 
+	if (free < 0) {
+		err = -ENOMEM;
+		goto out;
+	}
+
 	if (table->total == table->max) {
 		/* No free vlan entries */
 		err = -ENOSPC;