ipv6: Set mcast_hops to IPV6_DEFAULT_MCASTHOPS when -1 was given.

We need to set np->mcast_hops to it's default value at this moment
otherwise when we use it and found it's value is -1, the logic to
get default hop limit doesn't take multicast into account and will
return wrong hop limit(IPV6_DEFAULT_HOPLIMIT) which is for unicast.

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

diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c
index c99e3ee9781f246f82185e8a0e246e02a258cf82..26cb08c84b7488d533eafcccf44b3c134b8b9b2d 100644 (file)
--- a/net/ipv6/ipv6_sockglue.c
+++ b/net/ipv6/ipv6_sockglue.c
@@ -503,7 +503,7 @@ done:
                        goto e_inval;
                if (val > 255 || val < -1)
                        goto e_inval;
-               np->mcast_hops = val;
+               np->mcast_hops = (val == -1 ? IPV6_DEFAULT_MCASTHOPS : val);
                retv = 0;
                break;