diff options
| author | Florian Westphal <fw@strlen.de> | 2017-07-10 15:06:39 +0200 |
|---|---|---|
| committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2017-07-24 12:20:10 +0200 |
| commit | 56a97e701c49ff66dd1a5e5e02775209ab5147d3 (patch) | |
| tree | 248560469ad38cb17a67be395dad3c590624e724 | |
| parent | 7a68ada6ec7d88c68057d3a4c2a517eb94289976 (diff) | |
netfilter: expect: add to hash table after expect init
assuming we have lockless readers we should make sure they can only
see expectations that have already been initialized.
hlist_add_head_rcu acts as memory barrier, move it after timer setup.
Theoretically we could crash due to a del_timer() on other cpu
seeing garbage data.
Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
| -rw-r--r-- | net/netfilter/nf_conntrack_expect.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/net/netfilter/nf_conntrack_expect.c b/net/netfilter/nf_conntrack_expect.c index 899c2c36da13..2c63808bea96 100644 --- a/net/netfilter/nf_conntrack_expect.c +++ b/net/netfilter/nf_conntrack_expect.c @@ -368,12 +368,6 @@ static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) /* two references : one for hash insert, one for the timer */ refcount_add(2, &exp->use); - hlist_add_head_rcu(&exp->lnode, &master_help->expectations); - master_help->expecting[exp->class]++; - - hlist_add_head_rcu(&exp->hnode, &nf_ct_expect_hash[h]); - net->ct.expect_count++; - setup_timer(&exp->timeout, nf_ct_expectation_timed_out, (unsigned long)exp); helper = rcu_dereference_protected(master_help->helper, @@ -384,6 +378,12 @@ static void nf_ct_expect_insert(struct nf_conntrack_expect *exp) } add_timer(&exp->timeout); + hlist_add_head_rcu(&exp->lnode, &master_help->expectations); + master_help->expecting[exp->class]++; + + hlist_add_head_rcu(&exp->hnode, &nf_ct_expect_hash[h]); + net->ct.expect_count++; + NF_CT_STAT_INC(net, expect_create); } |