Fixed some issues found by valgrind

(one testcase, one memory leak and some accesses to not initialized memory)


mysql-test/r/events_scheduling.result:
  Changed event timer to two seconds to not get problems with slow system or when running with valgrind
mysql-test/t/events_scheduling.test:
  Changed event timer to two seconds to not get problems with slow system or when running with valgrind
mysql-test/valgrind.supp:
  Avoid purify warnings from DBUG library (safe to do)
sql/ha_berkeley.cc:
  Fix problem with not freed memory
sql/sql_class.cc:
  Ensure that row_count is initalized (as we otherwise may access it uninitialized)
sql/sql_show.cc:
  c_ptr -> ptr to avoid accessing not initialized memory
sql/sql_yacc.yy:
  Fix to not access not initialized memory
sql/table.cc:
  Fix to not access not initialized memory
sql/time.cc:
  Fix to not access not initialized memory

mysql-test/r/events_scheduling.result

@@ -6,7 +6,7 @@ CREATE TABLE table_3(a int);
 CREATE TABLE table_4(a int);
 CREATE TABLE T19170(s1 TIMESTAMP);
 SET GLOBAL event_scheduler=1;
-CREATE EVENT E19170 ON SCHEDULE EVERY 1 SECOND DO INSERT INTO T19170 VALUES(CURRENT_TIMESTAMP);
+CREATE EVENT E19170 ON SCHEDULE EVERY 2 SECOND DO INSERT INTO T19170 VALUES(CURRENT_TIMESTAMP);
 CREATE EVENT two_sec ON SCHEDULE EVERY 2 SECOND DO INSERT INTO table_1 VALUES(1);
 CREATE EVENT start_n_end
 ON SCHEDULE EVERY 1 SECOND

mysql-test/t/events_scheduling.test

@@ -6,7 +6,9 @@ CREATE TABLE table_3(a int);
 CREATE TABLE table_4(a int);
 CREATE TABLE T19170(s1 TIMESTAMP);
 SET GLOBAL event_scheduler=1;
-CREATE EVENT E19170 ON SCHEDULE EVERY 1 SECOND DO INSERT INTO T19170 VALUES(CURRENT_TIMESTAMP);
+# We need to have 2 to make it safe with valgrind. This is probably because
+# of when we calculate the timestamp value
+CREATE EVENT E19170 ON SCHEDULE EVERY 2 SECOND DO INSERT INTO T19170 VALUES(CURRENT_TIMESTAMP);
 CREATE EVENT two_sec ON SCHEDULE EVERY 2 SECOND DO INSERT INTO table_1 VALUES(1);
 CREATE EVENT start_n_end
   ON SCHEDULE EVERY 1 SECOND

mysql-test/valgrind.supp

@@ -420,3 +420,16 @@
    fun:fprintf
    fun:print_stacktrace
 }
+
+#
+# Safe warnings, that may happen because of thread scheduling
+#
+
+{
+   dbug initialization
+   Memcheck:Leak
+   fun:malloc
+   fun:DbugMalloc
+   fun:ListAdd
+   fun:_db_set_
+}

sql/ha_berkeley.cc

@@ -361,6 +361,7 @@ static bool berkeley_show_logs(THD *thd, stat_print_fn *stat_print)
   init_sql_alloc(&show_logs_root, BDB_LOG_ALLOC_BLOCK_SIZE,
 		 BDB_LOG_ALLOC_BLOCK_SIZE);
   *root_ptr= &show_logs_root;
+  all_logs= free_logs= 0;
 
   if ((error= db_env->log_archive(db_env, &all_logs,
 				  DB_ARCH_ABS | DB_ARCH_LOG)) ||
@@ -395,6 +396,10 @@ static bool berkeley_show_logs(THD *thd, stat_print_fn *stat_print)
     }
   }
 err:
+  if (all_logs)
+    free(all_logs);
+  if (free_logs)
+    free(free_logs);
   free_root(&show_logs_root,MYF(0));
   *root_ptr= old_mem_root;
   DBUG_RETURN(error);

sql/sql_class.cc

@@ -228,7 +228,7 @@ THD::THD()
   hash_clear(&handler_tables_hash);
   tmp_table=0;
   used_tables=0;
-  cuted_fields= sent_row_count= 0L;
+  cuted_fields= sent_row_count= row_count= 0L;
   limit_found_rows= 0;
   statement_id_counter= 0UL;
 #ifdef ERROR_INJECT_SUPPORT

sql/sql_show.cc

@@ -4178,7 +4178,7 @@ copy_event_to_schema_table(THD *thd, TABLE *sch_table, TABLE *event_table)
       DBUG_RETURN(1);
 
     sch_table->field[7]->set_notnull();
-    sch_table->field[7]->store(show_str.c_ptr(), show_str.length(), scs);
+    sch_table->field[7]->store(show_str.ptr(), show_str.length(), scs);
 
     LEX_STRING *ival= &interval_type_to_name[et.interval];
     sch_table->field[8]->set_notnull();

sql/sql_yacc.yy

@@ -1385,7 +1385,7 @@ ev_schedule_time: EVERY_SYM expr interval
                   String str(buff,(uint32) sizeof(buff), system_charset_info);
                   String *str2= $2->val_str(&str);
                   my_error(ER_WRONG_VALUE, MYF(0), "AT",
-                           str2? str2->c_ptr():"NULL");
+                           str2? str2->c_ptr_safe():"NULL");
                   YYABORT;
                   break;
                 }
@@ -1436,8 +1436,8 @@ ev_starts: /* empty */
                   char buff[20];
                   String str(buff,(uint32) sizeof(buff), system_charset_info);
                   String *str2= $2->val_str(&str);
-                  my_error(ER_WRONG_VALUE, MYF(0), "STARTS", str2? str2->c_ptr():
+                  my_error(ER_WRONG_VALUE, MYF(0), "STARTS",
-                                                                   NULL);
+	                   str2 ? str2->c_ptr_safe() : NULL);
                   YYABORT;
                   break;
                 }

sql/table.cc

@@ -2392,26 +2392,28 @@ table_check_intact(TABLE *table, uint table_f_count,
                         table_f_count, table->s->fields);
       }
       else
+      {
         /*
           moving from newer mysql to older one -> let's say not an error but
-          will check the definition afterwards. If a column was added at the end
+          will check the definition afterwards. If a column was added at the
-          then we don't care much since it's not in the middle.
+          end then we don't care much since it's not in the middle.
         */
         error= FALSE;
+      }
     }
     //definitely something has changed
     char buffer[255];
-    for (i=0 ;i < table_f_count; ++i, ++table_def)
+    for (i=0 ; i < table_f_count; i++, table_def++)
     {      
-      Field *field= table->field[i];
       String sql_type(buffer, sizeof(buffer), system_charset_info);
       sql_type.length(0);
       /*
         name changes are not fatal, we use sequence numbers => no prob for us
         but this can show tampered table or broken table.
       */
-      if (!fields_diff_count || i < table->s->fields)
+      if (i < table->s->fields)
       {
+        Field *field= table->field[i];
         if (strncmp(field->field_name, table_def->name.str,
                                        table_def->name.length))
         {
@@ -2459,7 +2461,7 @@ table_check_intact(TABLE *table, uint table_f_count,
       else
       {
         sql_print_error("(%s) Expected field %s at position %d to have type %s "
-                        " but no field found.", table_def->name.str,
+                        " but no field found.", table->alias,
                         table_def->name.str, i, table_def->type.str);
         error= TRUE;        
       }

sql/time.cc

@@ -692,6 +692,7 @@ void make_truncated_value_warning(THD *thd, const char *str_val,
   char buff[128];
   String str(buff,(uint32) sizeof(buff), system_charset_info);
   str.copy(str_val, str_length, system_charset_info);
+  str[str_length]= 0;               // Ensure we have end 0 for snprintf
 
   switch (time_type) {
     case MYSQL_TIMESTAMP_DATE: