From: Liping Zhang Date: Tue, 12 Jul 2016 11:45:00 +0000 (+0800) Subject: netfilter: conntrack: protect early_drop by rcu read lock X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3101e0fc1f6e809d38fbb5845c6c5eb0eefeda07;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git netfilter: conntrack: protect early_drop by rcu read lock User can add ct entry via nfnetlink(IPCTNL_MSG_CT_NEW), and if the total number reach the nf_conntrack_max, we will try to drop some ct entries. But in this case(the main function call path is ctnetlink_create_conntrack -> nf_conntrack_alloc -> early_drop), rcu_read_lock is not held, so race with hash resize will happen. Fixes: 242922a02717 ("netfilter: conntrack: simplify early_drop") Cc: Florian Westphal Signed-off-by: Liping Zhang Signed-off-by: Pablo Neira Ayuso --- diff --git a/net/netfilter/nf_conntrack_core.c b/net/netfilter/nf_conntrack_core.c index e0e9c9a0f5ba..2d46225501c1 100644 --- a/net/netfilter/nf_conntrack_core.c +++ b/net/netfilter/nf_conntrack_core.c @@ -880,6 +880,7 @@ static noinline int early_drop(struct net *net, unsigned int _hash) struct hlist_nulls_head *ct_hash; unsigned hash, sequence, drops; + rcu_read_lock(); do { sequence = read_seqcount_begin(&nf_conntrack_generation); hash = scale_hash(_hash++); @@ -887,6 +888,8 @@ static noinline int early_drop(struct net *net, unsigned int _hash) } while (read_seqcount_retry(&nf_conntrack_generation, sequence)); drops = early_drop_list(net, &ct_hash[hash]); + rcu_read_unlock(); + if (drops) { NF_CT_STAT_ADD_ATOMIC(net, early_drop, drops); return true;