Fxied a crashing bug caused by a buffer overflow

lib/MySQL_HostGroups_Manager.cpp

@@ -3631,7 +3631,7 @@ void MySQL_HostGroups_Manager::update_galera_set_offline(char *_hostname, int _p
 	char *q=NULL;
 	char *error=NULL;
 	q=(char *)"SELECT hostgroup_id FROM mysql_servers JOIN mysql_galera_hostgroups ON hostgroup_id=writer_hostgroup OR hostgroup_id=backup_writer_hostgroup OR hostgroup_id=reader_hostgroup WHERE hostname='%s' AND port=%d AND status<>3";
-	query=(char *)malloc(strlen(q)+strlen(_hostname)+32);
+	query=(char *)malloc(strlen(q)+strlen(_hostname)+1024); // increased this buffer as it is used for other queries too
 	sprintf(query,q,_hostname,_port);
 	mydb->execute_statement(query, &error , &cols , &affected_rows , &resultset);
 	if (error) {
@@ -3779,7 +3779,7 @@ void MySQL_HostGroups_Manager::update_galera_set_read_only(char *_hostname, int
 			mydb->execute("DELETE FROM mysql_servers_incoming");
 			mydb->execute("INSERT INTO mysql_servers_incoming SELECT hostgroup_id, hostname, port, gtid_port, weight, status, compression, max_connections, max_replication_lag, use_ssl, max_latency_ms, comment FROM mysql_servers");
 			q=(char *)"UPDATE OR IGNORE mysql_servers_incoming SET hostgroup_id=(SELECT reader_hostgroup FROM mysql_galera_hostgroups WHERE writer_hostgroup=%d) WHERE hostname='%s' AND port=%d AND hostgroup_id<>(SELECT reader_hostgroup FROM mysql_galera_hostgroups WHERE writer_hostgroup=%d)";
-			query=(char *)malloc(strlen(q)+strlen(_hostname)+64);
+			query=(char *)malloc(strlen(q)+strlen(_hostname)+512);
 			sprintf(query,q,_writer_hostgroup,_hostname,_port,_writer_hostgroup);
 			mydb->execute(query);
 			//free(query);
@@ -3927,7 +3927,7 @@ void MySQL_HostGroups_Manager::update_galera_set_writer(char *_hostname, int _po
 			mydb->execute("DELETE FROM mysql_servers_incoming");
 			mydb->execute("INSERT INTO mysql_servers_incoming SELECT hostgroup_id, hostname, port, gtid_port, weight, status, compression, max_connections, max_replication_lag, use_ssl, max_latency_ms, comment FROM mysql_servers");
 			q=(char *)"UPDATE OR IGNORE mysql_servers_incoming SET hostgroup_id=%d WHERE hostname='%s' AND port=%d AND hostgroup_id<>%d";
-			query=(char *)malloc(strlen(q)+strlen(_hostname)+256);
+			query=(char *)malloc(strlen(q)+strlen(_hostname)+1024); // increased this buffer as it is used for other queries too
 			sprintf(query,q,_writer_hostgroup,_hostname,_port,_writer_hostgroup);
 			mydb->execute(query);
 			//free(query);