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Date: Tue, 08 Jul 2008 12:55:24 +0400 From: Pavel Emelyanov <xemul@...nvz.org> To: David Miller <davem@...emloft.net>, YOSHIFUJI Hideaki <yoshfuji@...ux-ipv6.org> CC: Linux Netdev List <netdev@...r.kernel.org>, Andrey Vagin <avagin@...allels.com> Subject: [PATCH] ipv6: fix race between ipv6_del_addr and DAD timer From: Andrey Vagin <avagin@...allels.com> Consider the following scenario: ipv6_del_addr(ifp) ipv6_ifa_notify(RTM_DELADDR, ifp) ip6_del_rt(ifp->rt) after returning from the ipv6_ifa_notify and enabling BH-s back, but *before* calling the addrconf_del_timer the ifp->timer fires and: addrconf_dad_timer(ifp) addrconf_dad_completed(ifp) ipv6_ifa_notify(RTM_NEWADDR, ifp) ip6_ins_rt(ifp->rt) then return back to the ipv6_del_addr and: in6_ifa_put(ifp) inet6_ifa_finish_destroy(ifp) dst_release(&ifp->rt->u.dst) After this we have an ifp->rt inserted into fib6 lists, but queued for gc, which in turn can result in oopses in the fib6_run_gc. Maybe some other nasty things, but we caught only the oops in gc so far. The solution is to disarm the ifp->timer before flushing the rt from it. Signed-off-by: Andrey Vagin <avagin@...allels.com> Signed-off-by: Pavel Emelyanov <xemul@...nvz.org> --- diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c index 147588f..ff61a5c 100644 --- a/net/ipv6/addrconf.c +++ b/net/ipv6/addrconf.c @@ -749,12 +749,12 @@ static void ipv6_del_addr(struct inet6_ifaddr *ifp) } write_unlock_bh(&idev->lock); + addrconf_del_timer(ifp); + ipv6_ifa_notify(RTM_DELADDR, ifp); atomic_notifier_call_chain(&inet6addr_chain, NETDEV_DOWN, ifp); - addrconf_del_timer(ifp); - /* * Purge or update corresponding prefix * -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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