From 474803d37e7fb6291d22cb964014afe457ba5212 Mon Sep 17 00:00:00 2001 From: Liping Zhang Date: Sun, 3 Jul 2016 13:18:44 +0800 Subject: [PATCH] netfilter: cttimeout: unlink timeout obj again when hash resize happen Imagine such situation, nf_conntrack_htable_size now is 4096, we are doing ctnl_untimeout, and iterate on 3000# bucket. Meanwhile, another user try to reduce hash size to 2048, then all nf_conn are removed to the new hashtable. When this hash resize operation finished, we still try to itreate ct begin from 3000# bucket, find nothing to do and just return. We may miss unlinking some timeout objects. And later we will end up with invalid references to timeout object that are already gone. So when we find that hash resize happened, try to unlink timeout objects from the 0# bucket again. Signed-off-by: Liping Zhang Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nfnetlink_cttimeout.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/net/netfilter/nfnetlink_cttimeout.c b/net/netfilter/nfnetlink_cttimeout.c index 3c84f14326f5..4cdcd969b64c 100644 --- a/net/netfilter/nfnetlink_cttimeout.c +++ b/net/netfilter/nfnetlink_cttimeout.c @@ -303,16 +303,24 @@ static void ctnl_untimeout(struct net *net, struct ctnl_timeout *timeout) { struct nf_conntrack_tuple_hash *h; const struct hlist_nulls_node *nn; + unsigned int last_hsize; + spinlock_t *lock; int i; local_bh_disable(); - for (i = 0; i < nf_conntrack_htable_size; i++) { - nf_conntrack_lock(&nf_conntrack_locks[i % CONNTRACK_LOCKS]); - if (i < nf_conntrack_htable_size) { - hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode) - untimeout(h, timeout); +restart: + last_hsize = nf_conntrack_htable_size; + for (i = 0; i < last_hsize; i++) { + lock = &nf_conntrack_locks[i % CONNTRACK_LOCKS]; + nf_conntrack_lock(lock); + if (last_hsize != nf_conntrack_htable_size) { + spin_unlock(lock); + goto restart; } - spin_unlock(&nf_conntrack_locks[i % CONNTRACK_LOCKS]); + + hlist_nulls_for_each_entry(h, nn, &nf_conntrack_hash[i], hnnode) + untimeout(h, timeout); + spin_unlock(lock); } local_bh_enable(); } -- 2.20.1