netfilter: ipset: Pass lockdep expression to RCU lists

ip_set_type_list is traversed using list_for_each_entry_rcu
outside an RCU read-side critical section but under the protection
of ip_set_type_mutex.

Hence, add corresponding lockdep expression to silence false-positive
warnings, and harden RCU lists.

Signed-off-by: Amol Grover <frextrite@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Author: frextrite

net/netfilter/ipset/ip_set_core.c

@@ -86,7 +86,8 @@ find_set_type(const char *name, u8 family, u8 revision)
 {
 	struct ip_set_type *type;
 
-	list_for_each_entry_rcu(type, &ip_set_type_list, list)
+	list_for_each_entry_rcu(type, &ip_set_type_list, list,
+				lockdep_is_held(&ip_set_type_mutex))
 		if (STRNCMP(type->name, name) &&
 		    (type->family == family ||
 		     type->family == NFPROTO_UNSPEC) &&