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| author | WANG Cong <xiyou.wangcong@gmail.com> | 2015-03-31 11:01:46 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-04-02 20:52:34 -0400 |
| commit | 419df12fb5fa558451319276838c1842f2b11f8f (patch) | |
| tree | 711c055fc40c8972b9f3cf91c572a00ca80ed7cb /net/ipv6 | |
| parent | ed785309c94445dd90e242370e1f7bb034e008fd (diff) | |
| download | linux-exynos-419df12fb5fa558451319276838c1842f2b11f8f.tar.gz linux-exynos-419df12fb5fa558451319276838c1842f2b11f8f.tar.bz2 linux-exynos-419df12fb5fa558451319276838c1842f2b11f8f.zip | |
net: move fib_rules_unregister() under rtnl lock
We have to hold rtnl lock for fib_rules_unregister()
otherwise the following race could happen:
fib_rules_unregister(): fib_nl_delrule():
... ...
... ops = lookup_rules_ops();
list_del_rcu(&ops->list);
list_for_each_entry(ops->rules) {
fib_rules_cleanup_ops(ops); ...
list_del_rcu(); list_del_rcu();
}
Note, net->rules_mod_lock is actually not needed at all,
either upper layer netns code or rtnl lock guarantees
we are safe.
Cc: Alexander Duyck <alexander.h.duyck@redhat.com>
Cc: Thomas Graf <tgraf@suug.ch>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv6')
| -rw-r--r-- | net/ipv6/fib6_rules.c | 2 | ||||
| -rw-r--r-- | net/ipv6/ip6mr.c | 2 |
2 files changed, 3 insertions, 1 deletions
diff --git a/net/ipv6/fib6_rules.c b/net/ipv6/fib6_rules.c index 27ca79682efb..70bc6abc0639 100644 --- a/net/ipv6/fib6_rules.c +++ b/net/ipv6/fib6_rules.c @@ -322,7 +322,9 @@ out_fib6_rules_ops: static void __net_exit fib6_rules_net_exit(struct net *net) { + rtnl_lock(); fib_rules_unregister(net->ipv6.fib6_rules_ops); + rtnl_unlock(); } static struct pernet_operations fib6_rules_net_ops = { diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c index 52028f449a89..2f1fd9ffcb34 100644 --- a/net/ipv6/ip6mr.c +++ b/net/ipv6/ip6mr.c @@ -267,8 +267,8 @@ static void __net_exit ip6mr_rules_exit(struct net *net) list_del(&mrt->list); ip6mr_free_table(mrt); } - rtnl_unlock(); fib_rules_unregister(net->ipv6.mr6_rules_ops); + rtnl_unlock(); } #else #define ip6mr_for_each_table(mrt, net) \ |