Fix several Cluster memory leaks

include/ProxySQL_Cluster.hpp

@@ -378,6 +378,11 @@ struct fetch_query {
 	std::string msgs[3];
 };
 
+struct cluster_creds_t {
+	string user;
+	string pass;
+};
+
 class ProxySQL_Cluster {
 private:
 	SQLite3DB* mydb;
@@ -444,7 +449,7 @@ class ProxySQL_Cluster {
 
 		MySQL_Monitor::trigger_dns_cache_update();
 	}
-	void get_credentials(char**, char**);
+	cluster_creds_t get_credentials();
 	void set_username(char*);
 	void set_password(char*);
 	void set_admin_mysql_ifaces(char*);

lib/GTID_Server_Data.cpp

@@ -113,24 +113,14 @@ void connect_cb(EV_P_ ev_io *w, int revents) {
 }
 
 struct ev_io * new_connector(char *address, uint16_t gtid_port, uint16_t mysql_port) {
-	//struct sockaddr_in a;
 	int s;
 
 	if ((s = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
 		perror("socket");
 		close(s);
 		return NULL;
 	}
-/*
-	memset(&a, 0, sizeof(a));
-	a.sin_port = htons(gtid_port);
-	a.sin_family = AF_INET;
-	if (!inet_aton(address, (struct in_addr *) &a.sin_addr.s_addr)) {
-		perror("bad IP address format");
-		close(s);
-		return NULL;
-	}
-*/
+
 	ioctl_FIONBIO(s,1);
 
 	struct addrinfo hints;
@@ -142,15 +132,19 @@ struct ev_io * new_connector(char *address, uint16_t gtid_port, uint16_t mysql_p
 
 	char str_port[NI_MAXSERV+1];
 	sprintf(str_port,"%d", gtid_port);
+
 	int gai_rc = getaddrinfo(address, str_port, &hints, &res);
 	if (gai_rc) {
 		freeaddrinfo(res);
 		//exit here
 		return NULL;
 	}
 
-	//int status = connect(s, (struct sockaddr *) &a, sizeof(a));
 	int status = connect(s, res->ai_addr, res->ai_addrlen);
+
+	// Free linked list
+	freeaddrinfo(res);
+
 	if ((status == 0) || ((status == -1) && (errno == EINPROGRESS))) {
 		struct ev_io *c = (struct ev_io *)malloc(sizeof(struct ev_io));
 		if (c) {

lib/MySQL_Monitor.cpp

@@ -4091,6 +4091,14 @@ void* monitor_GR_thread_HG(void *arg) {
 		//  3. Delegate the async fetching + actions of 'MySQL_Monitor_State_Data' with conns on 'Monitor_Poll'.
 		///////////////////////////////////////////////////////////////////////////////////////
 
+		// NOTE: This is just a best effort to avoid invalid memory accesses during 'SHUTDOWN SLOW'. Since the
+		// previous section is 'time consuming', there are good changes that we can detect a shutdown before
+		// trying to perform the monitoring actions on the acquired 'mmsd'. This exact scenario and timing has
+		// been previously observed in the CI.
+		if (GloMyMon->shutdown) {
+			break;
+		}
+
 		// Handle 'mmsds' that failed to optain conns
 		for (const unique_ptr<MySQL_Monitor_State_Data>& mmsd : fail_mmsds) {
 			async_gr_mon_actions_handler(mmsd.get());

lib/ProxySQL_Admin.cpp

@@ -6033,6 +6033,7 @@ ProxySQL_Admin::ProxySQL_Admin() :
 	variables.p_memory_metrics_interval = 61;
 #ifdef DEBUG
 	variables.debug=GloVars.global.gdbg;
+	all_modules_started = false;
 	debug_output = 1;
 	proxysql_set_admin_debug_output(debug_output);
 #endif /* DEBUG */
@@ -6388,6 +6389,8 @@ bool ProxySQL_Admin::init(const bootstrap_info_t& bootstrap_info) {
 
 	Admin_HTTP_Server = NULL;
 	AdminRestApiServer = NULL;
+	AdminHTTPServer = NULL;
+
 /*
 	AdminRestApiServer = new ProxySQL_RESTAPI_Server();
 	AdminRestApiServer->print_version();