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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>
This commit is contained in:
Li Wei 2012-07-17 15:28:59 +08:00 committed by David S. Miller
parent c41e4130a2
commit a858d64b77
1 changed files with 3 additions and 0 deletions
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3
net/ipv6/mcast.c
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@ -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 ipv6_mc_socklist __rcu **lnk;
struct net *net = sock_net(sk); struct net *net = sock_net(sk);
if (!ipv6_addr_is_multicast(addr))
return -EINVAL;
spin_lock(&ipv6_sk_mc_lock); spin_lock(&ipv6_sk_mc_lock);
for (lnk = &np->ipv6_mc_list; for (lnk = &np->ipv6_mc_list;
(mc_lst = rcu_dereference_protected(*lnk, (mc_lst = rcu_dereference_protected(*lnk,