From 49428bf306f5d2e79e6030a62373a83ffbce0dea Mon Sep 17 00:00:00 2001
From: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Date: Thu, 11 Sep 2014 21:51:35 +0800
Subject: [PATCH] network: check result of if_nametoindex().

When we want to get index of a ifname which does not
exist, we should return a -EINVAL in this case.

Signed-off-by: Dongsheng Yang <yangds.fnst@cn.fujitsu.com>
Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com>
---
 src/lxc/network.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/lxc/network.c b/src/lxc/network.c
index ce10d3180..909f3fe35 100644
--- a/src/lxc/network.c
+++ b/src/lxc/network.c
@@ -144,6 +144,8 @@ int lxc_netdev_move_by_name(const char *ifname, pid_t pid)
 		return -EINVAL;
 
 	index = if_nametoindex(ifname);
+	if (!index)
+		return -EINVAL;
 
 	return lxc_netdev_move_by_index(index, pid);
 }