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: 242922a ("netfilter: conntrack: simplify early_drop")
Cc: Florian Westphal <fw@strlen.de>
Signed-off-by: Liping Zhang <liping.zhang@spreadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

net/netfilter/nf_conntrack_core.c

@@ -880,13 +880,16 @@ 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++);
 			ct_hash = nf_conntrack_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;