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linux-sg2042
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[IPV6]: Fix refcounting for anycast dst entries. 

Anycast DST entries allocated inside ipv6_dev_ac_inc are leaked when
network device is stopped without removing IPv6 addresses from it. The
bug has been observed in the reality on 2.6.18-rhel5 kernel.

In the above case addrconf_ifdown marks all entries as obsolete and
ip6_del_rt called from __ipv6_dev_ac_dec returns ENOENT. The
referrence is not dropped.

The fix is simple. DST entry should not keep referrence when stored in
the FIB6 tree.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Denis V. Lunev 2008-04-03 13:33:00 -07:00 committed by David S. Miller
parent eb86757931
commit 84f59370c5
1 changed files with 2 additions and 7 deletions
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9
net/ipv6/anycast.c
View File

@ -334,9 +334,7 @@ int ipv6_dev_ac_inc(struct net_device *dev, struct in6_addr *addr)
idev->ac_list = aca;
write_unlock_bh(&idev->lock);
dst_hold(&rt->u.dst);
if (ip6_ins_rt(rt))
dst_release(&rt->u.dst);
ip6_ins_rt(rt);
addrconf_join_solict(dev, &aca->aca_addr);
@ -378,10 +376,7 @@ int __ipv6_dev_ac_dec(struct inet6_dev *idev, struct in6_addr *addr)
addrconf_leave_solict(idev, &aca->aca_addr);
dst_hold(&aca->aca_rt->u.dst);
if (ip6_del_rt(aca->aca_rt))
dst_free(&aca->aca_rt->u.dst);
else
dst_release(&aca->aca_rt->u.dst);
ip6_del_rt(aca->aca_rt);
aca_put(aca);
return 0;