ipv6 mcast: Check address family of gf_group in getsockopt(MS_FILTER).

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>

1 files changed, 2 insertions, 0 deletions

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index 26b83e512a09..ce794d6acb70 100644
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -874,6 +874,8 @@ static int do_ipv6_getsockopt(struct sock *sk, int level, int optname,
                         return -EINVAL;
                 if (copy_from_user(&gsf, optval, GROUP_FILTER_SIZE(0)))
                         return -EFAULT;
+                if (gsf.gf_group.ss_family != AF_INET6)
+                        return -EADDRNOTAVAIL;
                 lock_sock(sk);
                 err = ip6_mc_msfget(sk, &gsf,
                         (struct group_filter __user *)optval, optlen);