From ccfec9e5cb2d48df5a955b7bf47f7782157d3bc2 Mon Sep 17 00:00:00 2001 From: Paolo Abeni Date: Mon, 24 Sep 2018 15:48:19 +0200 Subject: [PATCH] ip_tunnel: be careful when accessing the inner header 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 Signed-off-by: Paolo Abeni Signed-off-by: David S. Miller --- 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 c4f5602308ed..284a22154b4e 100644 --- a/net/ipv4/ip_tunnel.c +++ b/net/ipv4/ip_tunnel.c @@ -627,6 +627,7 @@ 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; @@ -636,6 +637,14 @@ 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);