netdev - [PATCH net-next] lwtunnel: be STRICT to validate the new LWTUNNEL_IP(6)

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Message-Id: <1993c1c08a6e3e278afeb173e4f4584eea5e14aa.1574331087.git.lucien.xin@gmail.com>
Date:   Thu, 21 Nov 2019 18:11:27 +0800
From:   Xin Long <lucien.xin@...il.com>
To:     network dev <netdev@...r.kernel.org>
Cc:     davem@...emloft.net, simon.horman@...ronome.com,
        jakub.kicinski@...ronome.com
Subject: [PATCH net-next] lwtunnel: be STRICT to validate the new LWTUNNEL_IP(6)_OPTS

LWTUNNEL_IP(6)_OPTS are the new items in ip(6)_tun_policy, which
are parsed by nla_parse_nested_deprecated(). We should check it
strictly by setting .strict_start_type = LWTUNNEL_IP(6)_OPTS.

This patch also adds missing LWTUNNEL_IP6_OPTS in ip6_tun_policy.

Fixes: 4ece47787077 ("lwtunnel: add options setting and dumping for geneve")
Signed-off-by: Xin Long <lucien.xin@...il.com>
---
 net/ipv4/ip_tunnel_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/ipv4/ip_tunnel_core.c b/net/ipv4/ip_tunnel_core.c
index 45405d2..0a7eaad 100644
--- a/net/ipv4/ip_tunnel_core.c
+++ b/net/ipv4/ip_tunnel_core.c
@@ -215,6 +215,7 @@ void ip_tunnel_get_stats64(struct net_device *dev,
 EXPORT_SYMBOL_GPL(ip_tunnel_get_stats64);
 
 static const struct nla_policy ip_tun_policy[LWTUNNEL_IP_MAX + 1] = {
+	[LWTUNNEL_IP_UNSPEC]	= { .strict_start_type = LWTUNNEL_IP_OPTS },
 	[LWTUNNEL_IP_ID]	= { .type = NLA_U64 },
 	[LWTUNNEL_IP_DST]	= { .type = NLA_U32 },
 	[LWTUNNEL_IP_SRC]	= { .type = NLA_U32 },
@@ -700,12 +701,14 @@ static const struct lwtunnel_encap_ops ip_tun_lwt_ops = {
 };
 
 static const struct nla_policy ip6_tun_policy[LWTUNNEL_IP6_MAX + 1] = {
+	[LWTUNNEL_IP6_UNSPEC]	= { .strict_start_type = LWTUNNEL_IP6_OPTS },
 	[LWTUNNEL_IP6_ID]		= { .type = NLA_U64 },
 	[LWTUNNEL_IP6_DST]		= { .len = sizeof(struct in6_addr) },
 	[LWTUNNEL_IP6_SRC]		= { .len = sizeof(struct in6_addr) },
 	[LWTUNNEL_IP6_HOPLIMIT]		= { .type = NLA_U8 },
 	[LWTUNNEL_IP6_TC]		= { .type = NLA_U8 },
 	[LWTUNNEL_IP6_FLAGS]		= { .type = NLA_U16 },
+	[LWTUNNEL_IP6_OPTS]		= { .type = NLA_NESTED },
 };
 
 static int ip6_tun_build_state(struct nlattr *attr,
-- 
2.1.0