ipv6: fix unappropriate errno returned for non-multicast address

We need to check the passed in multicast address and return
appropriate errno(EINVAL) if it is not valid. And it's no need
to walk through the ipv6_mc_list in this situation.

Signed-off-by: Li Wei <lw@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 3 insertions, 0 deletions

diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 6d0f5dc8e3a6..92f8e48e4ba4 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -211,6 +211,9 @@ int ipv6_sock_mc_drop(struct sock *sk, int ifindex, const struct in6_addr *addr)
         struct ipv6_mc_socklist __rcu **lnk;
         struct net *net = sock_net(sk);
 
+        if (!ipv6_addr_is_multicast(addr))
+                return -EINVAL;
+
         spin_lock(&ipv6_sk_mc_lock);
         for (lnk = &np->ipv6_mc_list;
              (mc_lst = rcu_dereference_protected(*lnk,