From: Pavel Emelyanov <xemul@openvz.org>
To: Linux Netdev List <netdev@vger.kernel.org>,
David Miller <davem@davemloft.net>
Subject: [PATCH][NETNS]: The ip6_fib_timer can work with garbage on net namespace stop.
Date: Mon, 21 Apr 2008 17:05:50 +0400 [thread overview]
Message-ID: <480C912E.70900@openvz.org> (raw)
The del_timer() function doesn't guarantee, that the timer callback
is not active by the time it exits.
Thus, the fib6_net_exit() may kfree() all the data, that is required
by the fib6_run_gc(). The race window is tiny, but slab poisoning can
trigger this bug.
Using del_timer_sync() will cure this.
Signed-off-by: Pavel Emelyanov <xemul@openvz.org>
---
diff --git a/net/ipv6/ip6_fib.c b/net/ipv6/ip6_fib.c
index 50f3f8f..1ee4fa1 100644
--- a/net/ipv6/ip6_fib.c
+++ b/net/ipv6/ip6_fib.c
@@ -1543,7 +1543,7 @@ out_timer:
static void fib6_net_exit(struct net *net)
{
rt6_ifdown(net, NULL);
- del_timer(net->ipv6.ip6_fib_timer);
+ del_timer_sync(net->ipv6.ip6_fib_timer);
kfree(net->ipv6.ip6_fib_timer);
#ifdef CONFIG_IPV6_MULTIPLE_TABLES
kfree(net->ipv6.fib6_local_tbl);
next reply other threads:[~2008-04-21 13:07 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-04-21 13:05 Pavel Emelyanov [this message]
2008-04-21 21:23 ` [PATCH][NETNS]: The ip6_fib_timer can work with garbage on net namespace stop David Miller
2008-04-23 16:14 ` YOSHIFUJI Hideaki / 吉藤英明
2008-04-24 8:03 ` David Miller
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