linux-kernel - [PATCH 3.16 263/328] ip_tunnel: be careful when accessing the inner header

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Message-ID: <lsq.1544392233.741162304@decadent.org.uk>
Date:   Sun, 09 Dec 2018 21:50:33 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Cong Wang" <xiyou.wangcong@...il.com>,
        "Paolo Abeni" <pabeni@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.16 263/328] ip_tunnel: be careful when accessing the
 inner header

3.16.62-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Paolo Abeni <pabeni@...hat.com>

commit ccfec9e5cb2d48df5a955b7bf47f7782157d3bc2 upstream.

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@...il.com>
Signed-off-by: Paolo Abeni <pabeni@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 net/ipv4/ip_tunnel.c | 9 +++++++++
 1 file changed, 9 insertions(+)

--- a/net/ipv4/ip_tunnel.c
+++ b/net/ipv4/ip_tunnel.c
@@ -551,6 +551,7 @@ void ip_tunnel_xmit(struct sk_buff *skb,
 		    const struct iphdr *tnl_params, const 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;
@@ -561,6 +562,14 @@ 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);