From e425ed1d3c75295a3578df1a8b0314a83d9a5ec8 Mon Sep 17 00:00:00 2001
From: David Ahern <dsa@cumulusnetworks.com>
Date: Tue, 10 Jan 2017 15:22:25 -0800
Subject: net: vrf: do not allow table id 0

[ Upstream commit 24c63bbc18e25d5d8439422aa5fd2d66390b88eb ]

Frank reported that vrf devices can be created with a table id of 0.
This breaks many of the run time table id checks and should not be
allowed. Detect this condition at create time and fail with EINVAL.

Fixes: 193125dbd8eb ("net: Introduce VRF device driver")
Reported-by: Frank Kellermann <frank.kellermann@atos.net>
Signed-off-by: David Ahern <dsa@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c
index 12b8085..95cf1d8 100644
--- a/drivers/net/vrf.c
+++ b/drivers/net/vrf.c
@@ -1239,6 +1239,8 @@ static int vrf_newlink(struct net *src_net, struct net_device *dev,
 		return -EINVAL;
 
 	vrf->tb_id = nla_get_u32(data[IFLA_VRF_TABLE]);
+	if (vrf->tb_id == RT_TABLE_UNSPEC)
+		return -EINVAL;
 
 	dev->priv_flags |= IFF_L3MDEV_MASTER;
 
-- 
cgit v0.10.2