ipv6: Protect ->mc_forwarding access with CONFIG_IPV6_MROUTE

Reported-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 4 insertions, 1 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 28e0e627229c..6fca01f136ad 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -469,8 +469,10 @@ static int inet6_netconf_msgsize_devconf(int type)
         /* type -1 is used for ALL */
         if (type == -1 || type == NETCONFA_FORWARDING)
                 size += nla_total_size(4);
+#ifdef CONFIG_IPV6_MROUTE
         if (type == -1 || type == NETCONFA_MC_FORWARDING)
                 size += nla_total_size(4);
+#endif
 
         return size;
 }
@@ -498,11 +500,12 @@ static int inet6_netconf_fill_devconf(struct sk_buff *skb, int ifindex,
         if ((type == -1 || type == NETCONFA_FORWARDING) &&
             nla_put_s32(skb, NETCONFA_FORWARDING, devconf->forwarding) < 0)
                 goto nla_put_failure;
+#ifdef CONFIG_IPV6_MROUTE
         if ((type == -1 || type == NETCONFA_MC_FORWARDING) &&
             nla_put_s32(skb, NETCONFA_MC_FORWARDING,
                         devconf->mc_forwarding) < 0)
                 goto nla_put_failure;
-
+#endif
         return nlmsg_end(skb, nlh);
 
 nla_put_failure: