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Subject[patch 069/101] Dont add anycast reference to device multiple times
From: Michal Wrobel <xmxwx@asn.pl>

[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@asn.pl>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
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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