Subject: [PATCH 05/38] ip_tunnel: be careful when accessing the inner header

From: Paolo Abeni <[email-masked]>
Date: Mon, 24 Sep 2018 15:48:19 +0200

[ Upstream commit ccfec9e5cb2d48df5a955b7bf47f7782157d3bc2]

Cong noted that we need the same checks introduced by commit 76c0ddd8c3a6
("ip6_tunnel: be careful when accessing the inner header")
even for ipv4 tunnels.

Fixes: c54419321455 ("GRE: Refactor GRE tunneling code.")
Suggested-by: Cong Wang <[email-masked]>
Signed-off-by: Paolo Abeni <[email-masked]>
Signed-off-by: David S. Miller <[email-masked]>
---
 net/ipv4/ip_tunnel.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/net/ipv4/ip_tunnel.c b/net/ipv4/ip_tunnel.c
index 4784f3f36b7e..72eee34092ae 100644
--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -635,6 +635,7 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
 		    const struct iphdr *tnl_params, u8 protocol)
 {
 	struct ip_tunnel *tunnel = netdev_priv(dev);
+	unsigned int inner_nhdr_len = 0;
 	const struct iphdr *inner_iph;
 	struct flowi4 fl4;
 	u8     tos, ttl;
@@ -644,6 +645,14 @@ void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
 	__be32 dst;
 	bool connected;
 
+	/* ensure we can access the inner net header, for several users below */
+	if (skb->protocol == htons(ETH_P_IP))
+		inner_nhdr_len = sizeof(struct iphdr);
+	else if (skb->protocol == htons(ETH_P_IPV6))
+		inner_nhdr_len = sizeof(struct ipv6hdr);
+	if (unlikely(!pskb_may_pull(skb, inner_nhdr_len)))
+		goto tx_error;
+
 	inner_iph = (const struct iphdr *)skb_inner_network_header(skb);
 	connected = (tunnel->parms.iph.daddr != 0);
 
-- 
2.17.2