Linux 4.4.162

[thirdparty/kernel/stable-queue.git] / releases / 4.4.162 / ip_tunnel-be-careful-when-accessing-the-inner-header.patch

From foo@baz Tue Oct 16 16:47:53 CEST 2018
From: Paolo Abeni <pabeni@redhat.com>
Date: Mon, 24 Sep 2018 15:48:19 +0200
Subject: ip_tunnel: be careful when accessing the inner header

From: Paolo Abeni <pabeni@redhat.com>

[ 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 <xiyou.wangcong@gmail.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv4/ip_tunnel.c |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -597,6 +597,7 @@ void ip_tunnel_xmit(struct sk_buff *skb,
 		    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;
@@ -607,6 +608,14 @@ void ip_tunnel_xmit(struct sk_buff *skb,
 	int err;
 	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);