[patch 069/101] Dont add anycast reference to device multiple times

[Greg KH]

From: Michal Wrobel <xmxwx@xxxxxx>

[IPV6]: anycast refcnt fix

This patch fixes a bug in Linux IPv6 stack which caused anycast address
to be added to a device prior DAD has been completed. This led to
incorrect reference count which resulted in infinite wait for
unregister_netdevice completion on interface removal.

Signed-off-by: Michal Wrobel <xmxwx@xxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxx>

---
 net/ipv6/addrconf.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-2.6.20.1.orig/net/ipv6/addrconf.c
+++ linux-2.6.20.1/net/ipv6/addrconf.c
@@ -469,6 +469,8 @@ static void dev_forward_change(struct in
 			ipv6_dev_mc_dec(dev, &addr);
 	}
 	for (ifa=idev->addr_list; ifa; ifa=ifa->if_next) {
+		if (ifa->flags&IFA_F_TENTATIVE)
+			continue;
 		if (idev->cnf.forwarding)
 			addrconf_join_anycast(ifa);
 		else

--
-
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