From d5d6e83eed715039c0a2672f46309274f435f75c Mon Sep 17 00:00:00 2001 From: David Ahern Date: Tue, 10 Jan 2017 15:22:25 -0800 Subject: [PATCH] net: vrf: do not allow table id 0 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: 2c44df3f81da ("net: Introduce VRF device driver") Reported-by: Frank Kellermann Signed-off-by: David Ahern Signed-off-by: David S. Miller --- drivers/net/vrf.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/net/vrf.c b/drivers/net/vrf.c index 0a067708aa39a..454f907d419a7 100644 --- a/drivers/net/vrf.c +++ b/drivers/net/vrf.c @@ -1252,6 +1252,8 @@ 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; -- 2.39.5