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>

diff --git a/src/lxc/network.c b/src/lxc/network.c
index ce10d318058c40e1ad629c4d0e5796d0b32fb36f..909f3fe355b383a0a4168deea37d0bd02e9c62c5 100644 (file)
--- 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);
 }