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[NETNS]: The ip6_fib_timer can work with garbage on net namespace stop.

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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Pavel Emelyanov 2008-04-21 14:23:03 -07:00 committed by David S. Miller
parent f25c3d613b
commit 2aed2827df
1 changed files with 1 additions and 1 deletions
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2
net/ipv6/ip6_fib.c
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@ -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);