dccp: do not use ipv6 header for ipv4 flow

commit e0aa67709f89d08c8d8e5bdd9e0b649df61d0090 upstream.

When a dual stack dccp listener accepts an ipv4 flow,
it should not attempt to use an ipv6 header or
inet6_iif() helper.

Fixes: 3df80d9320bc ("[DCCP]: Introduce DCCPv6")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 30455bf91b182c735e2c7fc543bb2b638f8a0008..c3ed865d262f8a60e7c08de3d50d979c967143a9 100644 (file)
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -491,8 +491,8 @@ static struct sock *dccp_v6_request_recv_sock(struct sock *sk,
                newnp->ipv6_mc_list = NULL;
                newnp->ipv6_ac_list = NULL;
                newnp->ipv6_fl_list = NULL;
-               newnp->mcast_oif   = inet6_iif(skb);
-               newnp->mcast_hops  = ipv6_hdr(skb)->hop_limit;
+               newnp->mcast_oif   = inet_iif(skb);
+               newnp->mcast_hops  = ip_hdr(skb)->ttl;
 
                /*
                 * No need to charge this sock to the relevant IPv6 refcnt debug socks count