ipv6: xfrm: dereference inner ipv6 header if encapsulated

In xfrm6_local_error use inner_header if the packet was encapsulated.

Cc: Steffen Klassert <steffen.klassert@secunet.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

1 files changed, 3 insertions, 1 deletions

diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 3ac5ab264fed..e092e306882d 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -59,10 +59,12 @@ static void xfrm6_local_rxpmtu(struct sk_buff *skb, u32 mtu)
 void xfrm6_local_error(struct sk_buff *skb, u32 mtu)
 {
         struct flowi6 fl6;
+        const struct ipv6hdr *hdr;
         struct sock *sk = skb->sk;
 
+        hdr = skb->encapsulation ? inner_ipv6_hdr(skb) : ipv6_hdr(skb);
         fl6.fl6_dport = inet_sk(sk)->inet_dport;
-        fl6.daddr = ipv6_hdr(skb)->daddr;
+        fl6.daddr = hdr->daddr;
 
         ipv6_local_error(sk, EMSGSIZE, &fl6, mtu);
 }