From: Denis V. Lunev Date: Thu, 3 Apr 2008 20:33:00 +0000 (-0700) Subject: [IPV6]: Fix refcounting for anycast dst entries. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=84f59370c519449c70dcc813b050f5cbbf0098e7;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [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 Signed-off-by: David S. Miller --- diff --git a/net/ipv6/anycast.c b/net/ipv6/anycast.c index 9c7f83fbc3a1..e5f56c953b58 100644 --- a/net/ipv6/anycast.c +++ b/net/ipv6/anycast.c @@ -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;