Bug #17340 SHOW CREATE TABLE from second session crashes the server

- no check was made that ndb thd object was allocated

sql/ha_ndbcluster.cc

@@ -8915,9 +8915,9 @@ ha_ndbcluster::generate_scan_filter(Ndb_cond_stack *ndb_cond_stack,
 /*
   get table space info for SHOW CREATE TABLE
 */
-char* ha_ndbcluster::get_tablespace_name()
+char* ha_ndbcluster::get_tablespace_name(THD *thd)
 {
-  Ndb *ndb= get_ndb();
+  Ndb *ndb= check_ndb_in_thd(thd);
   NDBDICT *ndbdict= ndb->getDictionary();
   NdbError ndberr;
   Uint32 id;
@@ -8941,11 +8941,11 @@ char* ha_ndbcluster::get_tablespace_name()
   }
 err:
   if (ndberr.status == NdbError::TemporaryError)
-    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
+    push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
 			ER_GET_TEMPORARY_ERRMSG, ER(ER_GET_TEMPORARY_ERRMSG),
 			ndberr.code, ndberr.message, "NDB");
   else
-    push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
+    push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_ERROR,
 			ER_GET_ERRMSG, ER(ER_GET_ERRMSG),
 			ndberr.code, ndberr.message, "NDB");
   return 0;

sql/ha_ndbcluster.h

@@ -724,7 +724,7 @@ static void set_tabname(const char *pathname, char *tabname);
   uint set_up_partition_info(partition_info *part_info,
                              TABLE *table,
                              void *tab);
-  char* get_tablespace_name();
+  char* get_tablespace_name(THD *thd);
   int set_range_data(void *tab, partition_info* part_info);
   int set_list_data(void *tab, partition_info* part_info);
   int complemented_pk_read(const byte *old_data, byte *new_data,

sql/handler.h

@@ -1712,7 +1712,7 @@ class handler :public Sql_alloc
   { return FALSE; }
   virtual char* get_foreign_key_create_info()
   { return(NULL);}  /* gets foreign key create string from InnoDB */
-  virtual char* get_tablespace_name()
+  virtual char* get_tablespace_name(THD *thd)
   { return(NULL);}  /* gets tablespace name from handler */
   /* used in ALTER TABLE; 1 if changing storage engine is allowed */
   virtual bool can_switch_engines() { return 1; }

sql/sql_show.cc

@@ -1138,7 +1138,7 @@ store_create_info(THD *thd, TABLE_LIST *table_list, String *packet,
       to the CREATE TABLE statement
     */
 
-    if ((for_str= file->get_tablespace_name()))
+    if ((for_str= file->get_tablespace_name(thd)))
     {
       packet->append(" TABLESPACE ");
       packet->append(for_str, strlen(for_str));