[PATCH] [IPV6] MCAST: Fix joining all-node multicast group on device initialization.

[YOSHIFUJI Hideaki / 吉藤英明 <yoshfuji@xxxxxxxxxxxxxx>]

[IPV6] MCAST: Fix joining all-node multicast group on device initialization.

Join all-node multicast group after assignment of dev->ip6_ptr
because it must be assigned when ipv6_dev_mc_inc() is called.
This fixes Bug#7817, reported by <gernoth@xxxxxxxxxxxxxxxxxxxxxxxxxx>.

Closes: 7817
Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@xxxxxxxxxxxxxx>

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index 171e5b5..2a7e461 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -341,6 +341,7 @@ void in6_dev_finish_destroy(struct inet6_dev *idev)
 static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 {
 	struct inet6_dev *ndev;
+	struct in6_addr maddr;
 
 	ASSERT_RTNL();
 
@@ -425,6 +426,11 @@ static struct inet6_dev * ipv6_add_dev(struct net_device *dev)
 #endif
 	/* protected by rtnl_lock */
 	rcu_assign_pointer(dev->ip6_ptr, ndev);
+
+	/* Join all-node multicast group */
+	ipv6_addr_all_nodes(&maddr);
+	ipv6_dev_mc_inc(dev, &maddr);
+
 	return ndev;
 }
 
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index a1c231a..882cde4 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -2258,8 +2258,6 @@ void ipv6_mc_up(struct inet6_dev *idev)
 
 void ipv6_mc_init_dev(struct inet6_dev *idev)
 {
-	struct in6_addr maddr;
-
 	write_lock_bh(&idev->lock);
 	rwlock_init(&idev->mc_lock);
 	idev->mc_gq_running = 0;
@@ -2275,10 +2273,6 @@ void ipv6_mc_init_dev(struct inet6_dev *idev)
 	idev->mc_maxdelay = IGMP6_UNSOLICITED_IVAL;
 	idev->mc_v1_seen = 0;
 	write_unlock_bh(&idev->lock);
-
-	/* Add all-nodes address. */
-	ipv6_addr_all_nodes(&maddr);
-	ipv6_dev_mc_inc(idev->dev, &maddr);
 }
 
 /*

-- 
YOSHIFUJI Hideaki @ USAGI Project  <yoshfuji@xxxxxxxxxxxxxx>
GPG-FP  : 9022 65EB 1ECF 3AD1 0BDF  80D8 4807 F894 E062 0EEA
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