From a88e39d8067e7a203be8c7f724b069e3928a2419 Mon Sep 17 00:00:00 2001
From: Hubert Krauze <hubert.krauze@ovh.pl>
Date: Wed, 9 Dec 2015 12:25:52 +0100
Subject: [PATCH] Check if master Bridge exists when LinkSetMaster

---
 link_linux.go | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/link_linux.go b/link_linux.go
index 60213bd..810fc4f 100644
--- a/link_linux.go
+++ b/link_linux.go
@@ -133,6 +133,9 @@ func LinkSetMaster(link Link, master *Bridge) error {
 		ensureIndex(masterBase)
 		index = masterBase.Index
 	}
+	if index <= 0 {
+		return fmt.Errorf("Device does not exist")
+	}
 	return LinkSetMasterByIndex(link, index)
 }