[PATCH 4.19 17/45] ipip: validate header length in ipip_tunnel_xmit

[Greg Kroah-Hartman]

From: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>

[ Upstream commit 47d858d0bdcd47cc1c6c9eeca91b091dd9e55637 ]

We need the same checks introduced by commit cb9f1b783850
("ip: validate header length on virtual device xmit") for
ipip tunnel.

Fixes: cb9f1b783850b ("ip: validate header length on virtual device xmit")
Signed-off-by: Haishuang Yan <yanhaishu...@cmss.chinamobile.com>
Signed-off-by: David S. Miller <da...@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
 net/ipv4/ipip.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/ipv4/ipip.c
+++ b/net/ipv4/ipip.c
@@ -281,6 +281,9 @@ static netdev_tx_t ipip_tunnel_xmit(stru
        const struct iphdr  *tiph = &tunnel->parms.iph;
        u8 ipproto;
 
+       if (!pskb_inet_may_pull(skb))
+               goto tx_error;
+
        switch (skb->protocol) {
        case htons(ETH_P_IP):
                ipproto = IPPROTO_IPIP;