net: ip6_gre: get ipv6hdr after skb_cow_head()

A KASAN:use-after-free bug was found related to ip6-erspan
while running selftests/net/ip6_gre_headroom.sh

It happens because of following sequence:
- ipv6hdr pointer is obtained from skb
- skb_cow_head() is called, skb->head memory is reallocated
- old data is accessed using ipv6hdr pointer

skb_cow_head() call was added in e41c7c68ea77 ("ip6erspan: make sure
enough headroom at xmit."), but looking at the history there was a
chance of similar bug because gre_handle_offloads() and pskb_trim()
can also reallocate skb->head memory. Fixes tag points to commit
which introduced possibility of this bug.

This patch moves ipv6hdr pointer assignment after skb_cow_head() call.

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Prashant Bhole <bhole_prashant_q7@lab.ntt.co.jp>
Reviewed-by: Greg Rose <gvrose8192@gmail.com>
Acked-by: William Tu <u9012063@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index c8cf2fdbb13b88cc1bf6b494a75407cdc16977eb..cd2cfb04e5d82010a5eb1800a53fc8007479c6f9 100644 (file)
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -927,7 +927,6 @@ tx_err:
 static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
                                         struct net_device *dev)
 {
-       struct ipv6hdr *ipv6h = ipv6_hdr(skb);
        struct ip6_tnl *t = netdev_priv(dev);
        struct dst_entry *dst = skb_dst(skb);
        struct net_device_stats *stats;
@@ -1010,6 +1009,8 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
                        goto tx_err;
                }
        } else {
+               struct ipv6hdr *ipv6h = ipv6_hdr(skb);
+
                switch (skb->protocol) {
                case htons(ETH_P_IP):
                        memset(&(IPCB(skb)->opt), 0, sizeof(IPCB(skb)->opt));