MDEV-4244 [PATCH] Buffer overruns and use-after-free errors

fixes for gcc 4.8 -fsanitize=address

sql/multi_range_read.cc

@@ -1632,7 +1632,7 @@ int DsMrr_impl::dsmrr_explain_info(uint mrr_mode, char *str, size_t size)
 
     uint used_str_len= strlen(used_str);
     uint copy_len= min(used_str_len, size);
-    memcpy(str, used_str, size);
+    memcpy(str, used_str, copy_len);
     return copy_len;
   }
   return 0;

sql/sql_show.cc

@@ -6617,20 +6617,20 @@ TABLE *create_schema_table(THD *thd, TABLE_LIST *table_list)
       break;
     case MYSQL_TYPE_DATE:
       if (!(item=new Item_return_date_time(fields_info->field_name,
-                                           MAX_DATE_WIDTH,
+                                           strlen(fields_info->field_name),
                                            fields_info->field_type)))
         DBUG_RETURN(0);
       break;
     case MYSQL_TYPE_TIME:
       if (!(item=new Item_return_date_time(fields_info->field_name,
-                                           MAX_TIME_FULL_WIDTH,
+                                           strlen(fields_info->field_name),
                                            fields_info->field_type)))
         DBUG_RETURN(0);
       break;
     case MYSQL_TYPE_TIMESTAMP:
     case MYSQL_TYPE_DATETIME:
       if (!(item=new Item_return_date_time(fields_info->field_name,
-                                           MAX_DATETIME_WIDTH,
+                                           strlen(fields_info->field_name),
                                            fields_info->field_type)))
         DBUG_RETURN(0);
       break;