locking issue in alter_reply

diff -u -r1.2 ip_conntrack_core.c
@@ -1075,9 +1075,9 @@
 int ip_conntrack_alter_reply(struct ip_conntrack *conntrack,
 			     const struct ip_conntrack_tuple *newreply)
 {
-	WRITE_LOCK(&ip_conntrack_lock);
+	READ_LOCK(&ip_conntrack_lock);
 	if (__ip_conntrack_find(newreply, conntrack)) {
-		WRITE_UNLOCK(&ip_conntrack_lock);
+		READ_UNLOCK(&ip_conntrack_lock);
 		return 0;
 	}
 	/* Should be unconfirmed, so not in hash table yet */

@@ -1089,7 +1089,7 @@
 	conntrack->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply;
 	if (!conntrack->master && list_empty(&conntrack->sibling_list))
 		conntrack->helper = ip_ct_find_helper(newreply);
-	WRITE_UNLOCK(&ip_conntrack_lock);
+	READ_UNLOCK(&ip_conntrack_lock);
 
 	return 1;
 }