Fix for bug#28666 CREATE EVENT ... EVERY 0 SECOND let server crash

A missing check for zero value of interval was added.

mysql-test/r/events_bugs.result

@@ -528,4 +528,33 @@ DROP EVENT e3;
 DROP EVENT e2;
 DROP EVENT e1;
 SET TIME_ZONE=@save_time_zone;
+drop event if exists new_event;
+CREATE EVENT new_event ON SCHEDULE EVERY 0 SECOND DO SELECT 1;
+ERROR HY000: INTERVAL is either not positive or too big
+CREATE EVENT new_event ON SCHEDULE EVERY (SELECT 0) SECOND DO SELECT 1;
+ERROR HY000: INTERVAL is either not positive or too big
+CREATE EVENT new_event ON SCHEDULE EVERY "abcdef" SECOND DO SELECT 1;
+ERROR HY000: INTERVAL is either not positive or too big
+CREATE EVENT new_event ON SCHEDULE EVERY "0abcdef" SECOND DO SELECT 1;
+ERROR HY000: INTERVAL is either not positive or too big
+CREATE EVENT new_event ON SCHEDULE EVERY "a1bcdef" SECOND DO SELECT 1;
+ERROR HY000: INTERVAL is either not positive or too big
+CREATE EVENT new_event ON SCHEDULE EVERY (SELECT "abcdef" UNION SELECT "abcdef") SECOND DO SELECT 1;
+ERROR HY000: INTERVAL is either not positive or too big
+CREATE EVENT new_event ON SCHEDULE EVERY (SELECT "0abcdef") SECOND DO SELECT 1;
+ERROR HY000: INTERVAL is either not positive or too big
+CREATE EVENT new_event ON SCHEDULE EVERY (SELECT "a1bcdef") SECOND DO SELECT 1;
+ERROR HY000: INTERVAL is either not positive or too big
+CREATE EVENT new_event ON SCHEDULE AT "every day" DO SELECT 1;
+ERROR HY000: Incorrect AT value: 'every day'
+CREATE EVENT new_event ON SCHEDULE AT "0every day" DO SELECT 1;
+ERROR HY000: Incorrect AT value: '0every day'
+CREATE EVENT new_event ON SCHEDULE AT (SELECT "every day") DO SELECT 1;
+ERROR HY000: Incorrect AT value: 'every day'
+CREATE EVENT new_event ON SCHEDULE AT NOW() STARTS NOW() DO SELECT 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'STARTS NOW() DO SELECT 1' at line 1
+CREATE EVENT new_event ON SCHEDULE AT NOW() ENDS NOW() DO SELECT 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'ENDS NOW() DO SELECT 1' at line 1
+CREATE EVENT new_event ON SCHEDULE AT NOW() STARTS NOW() ENDS NOW() DO SELECT 1;
+ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'STARTS NOW() ENDS NOW() DO SELECT 1' at line 1
 drop database events_test;

mysql-test/t/events_bugs.test

@@ -610,6 +610,44 @@ DROP EVENT e1;
 
 SET TIME_ZONE=@save_time_zone;
 
+#
+# START - BUG#28666 CREATE EVENT ... EVERY 0 SECOND let server crash
+#
+--disable_warnings
+drop event if exists new_event;
+--enable_warnings
+--error ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG
+CREATE EVENT new_event ON SCHEDULE EVERY 0 SECOND DO SELECT 1;
+--error ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG
+CREATE EVENT new_event ON SCHEDULE EVERY (SELECT 0) SECOND DO SELECT 1;
+--error ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG
+CREATE EVENT new_event ON SCHEDULE EVERY "abcdef" SECOND DO SELECT 1;
+--error ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG
+CREATE EVENT new_event ON SCHEDULE EVERY "0abcdef" SECOND DO SELECT 1;
+--error ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG
+CREATE EVENT new_event ON SCHEDULE EVERY "a1bcdef" SECOND DO SELECT 1;
+
+--error ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG
+CREATE EVENT new_event ON SCHEDULE EVERY (SELECT "abcdef" UNION SELECT "abcdef") SECOND DO SELECT 1;
+--error ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG
+CREATE EVENT new_event ON SCHEDULE EVERY (SELECT "0abcdef") SECOND DO SELECT 1;
+--error ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG
+CREATE EVENT new_event ON SCHEDULE EVERY (SELECT "a1bcdef") SECOND DO SELECT 1;
+
+--error ER_WRONG_VALUE
+CREATE EVENT new_event ON SCHEDULE AT "every day" DO SELECT 1;
+--error ER_WRONG_VALUE
+CREATE EVENT new_event ON SCHEDULE AT "0every day" DO SELECT 1;
+--error ER_WRONG_VALUE
+CREATE EVENT new_event ON SCHEDULE AT (SELECT "every day") DO SELECT 1;
+
+--error ER_PARSE_ERROR
+CREATE EVENT new_event ON SCHEDULE AT NOW() STARTS NOW() DO SELECT 1;
+--error ER_PARSE_ERROR
+CREATE EVENT new_event ON SCHEDULE AT NOW() ENDS NOW() DO SELECT 1;
+--error ER_PARSE_ERROR
+CREATE EVENT new_event ON SCHEDULE AT NOW() STARTS NOW() ENDS NOW() DO SELECT 1;
+
 # 
 # End of tests
 #

sql/event_data_objects.cc

@@ -413,7 +413,8 @@ Event_parse_data::init_interval(THD *thd)
   default:
     ;/* these are the microsec stuff */
   }
-  if (interval_tmp.neg || expression > EVEX_MAX_INTERVAL_VALUE)
+  if (interval_tmp.neg || expression == 0 ||
+      expression > EVEX_MAX_INTERVAL_VALUE)
   {
     my_error(ER_EVENT_INTERVAL_NOT_POSITIVE_OR_TOO_BIG, MYF(0));
     DBUG_RETURN(EVEX_BAD_PARAMS);