Do not accept proxy notify update until subscription complete

src/stratifier.c

@@ -155,6 +155,8 @@ static struct {
 
 	int nonce2len;
 	int enonce2varlen;
+
+	bool subscribed;
 } proxy_base;
 
 static int64_t workbase_id;
@@ -760,6 +762,7 @@ static bool update_subscribe(ckpool_t *ckp)
 	free(buf);
 
 	ck_wlock(&workbase_lock);
+	proxy_base.subscribed = true;
 	proxy_base.diff = ckp->startdiff;
 	/* Length is checked by generator */
 	strcpy(proxy_base.enonce1, json_string_value(json_object_get(val, "enonce1")));
@@ -794,6 +797,11 @@ static void update_notify(ckpool_t *ckp)
 		return;
 	}
 
+	if (unlikely(!proxy_base.subscribed)) {
+		LOGINFO("No valid proxy subscription to update notify yet");
+		return;
+	}
+
 	LOGDEBUG("Update notify: %s", buf);
 	wb = ckzalloc(sizeof(workbase_t));
 	val = json_loads(buf, 0, NULL);