MDEV-4634 Crash in CONVERT_TZ

Item_func_min_max::get_date() did not check the
returned value against the fuzzy_date flags, so
it could return a bad value to the caller that
expects a good date (e.h. CONVERT_TZ).


modified:
  mysql-test/r/type_date.result
  mysql-test/r/type_datetime.result
  mysql-test/r/type_time.result
  mysql-test/t/type_date.test
  mysql-test/t/type_datetime.test
  mysql-test/t/type_time.test
  sql/item_func.cc
  sql/item_timefunc.cc
  sql/mysql_priv.h
  sql/time.cc

mysql-test/r/type_date.result

@@ -298,3 +298,14 @@ insert t1 values ('2010-10-10 15:foobar');
 Warnings:
 Warning	1265	Data truncated for column 'f1' at row 1
 drop table t1;
+#
+# MDEV-4634 Crash in CONVERT_TZ
+#
+SELECT CONVERT_TZ(GREATEST(DATE('2021-00-00'),DATE('2022-00-00')),'+00:00','+7:5');
+CONVERT_TZ(GREATEST(DATE('2021-00-00'),DATE('2022-00-00')),'+00:00','+7:5')
+NULL
+Warnings:
+Warning	1292	Incorrect datetime value: '2022-00-00 00:00:00'
+#
+# End of 5.3 tests
+#

mysql-test/r/type_datetime.result

@@ -681,4 +681,12 @@ c	a	b
 1	1	0000-00-00
 3	NULL	NULL
 drop table t1,t2;
+#
+# MDEV-4634 Crash in CONVERT_TZ
+#
+SELECT CONVERT_TZ(GREATEST(TIMESTAMP('2021-00-00'),TIMESTAMP('2022-00-00')),'+00:00','+7:5');
+CONVERT_TZ(GREATEST(TIMESTAMP('2021-00-00'),TIMESTAMP('2022-00-00')),'+00:00','+7:5')
+NULL
+Warnings:
+Warning	1292	Incorrect datetime value: '2022-00-00 00:00:00'
 End of 5.3 tests

mysql-test/r/type_time.result

@@ -173,3 +173,14 @@ select f1, f1 = '2010-10-11 23:38:57' from t1;
 f1	f1 = '2010-10-11 23:38:57'
 23:38:57	0
 drop table t1;
+#
+# MDEV-4634 Crash in CONVERT_TZ
+#
+SELECT CONVERT_TZ(GREATEST(TIME('00:00:00'),TIME('00:00:00')),'+00:00','+7:5');
+CONVERT_TZ(GREATEST(TIME('00:00:00'),TIME('00:00:00')),'+00:00','+7:5')
+NULL
+Warnings:
+Warning	1292	Incorrect datetime value: '0000-00-00 00:00:00'
+#
+# End of 5.3 tests
+#

mysql-test/t/type_date.test

@@ -282,3 +282,11 @@ create table t1 (f1 date, key (f1));
 insert t1 values ('2010-10-10 15:foobar');
 drop table t1;
 
+--echo #
+--echo # MDEV-4634 Crash in CONVERT_TZ
+--echo #
+SELECT CONVERT_TZ(GREATEST(DATE('2021-00-00'),DATE('2022-00-00')),'+00:00','+7:5');
+
+--echo #
+--echo # End of 5.3 tests
+--echo #

mysql-test/t/type_datetime.test

@@ -486,5 +486,10 @@ select * from t2 left join t1 on t1.a=t2.c where t1.b is null;
 
 drop table t1,t2;
 
+--echo #
+--echo # MDEV-4634 Crash in CONVERT_TZ
+--echo #
+SELECT CONVERT_TZ(GREATEST(TIMESTAMP('2021-00-00'),TIMESTAMP('2022-00-00')),'+00:00','+7:5');
+
 --echo End of 5.3 tests
 

mysql-test/t/type_time.test

@@ -123,3 +123,11 @@ insert into t1 values ('23:38:57');
 select f1, f1 = '2010-10-11 23:38:57' from t1;
 drop table t1;
 
+--echo #
+--echo # MDEV-4634 Crash in CONVERT_TZ
+--echo #
+SELECT CONVERT_TZ(GREATEST(TIME('00:00:00'),TIME('00:00:00')),'+00:00','+7:5');
+
+--echo #
+--echo # End of 5.3 tests
+--echo #

sql/item_func.cc

@@ -2469,6 +2469,12 @@ bool Item_func_min_max::get_date(MYSQL_TIME *ltime, uint fuzzy_date)
       min_max= res;
   }
   unpack_time(min_max, ltime);
+
+  if (!(fuzzy_date & TIME_TIME_ONLY) &&
+      ((null_value= check_date_with_warn(ltime, fuzzy_date,
+                                         MYSQL_TIMESTAMP_ERROR))))
+    return true;
+
   if (compare_as_dates->field_type() == MYSQL_TYPE_DATE)
   {
     ltime->time_type= MYSQL_TIMESTAMP_DATE;

sql/item_timefunc.cc

@@ -2306,16 +2306,8 @@ bool Item_date_typecast::get_date(MYSQL_TIME *ltime, uint fuzzy_date)
     return 1;
   ltime->hour= ltime->minute= ltime->second= ltime->second_part= 0;
   ltime->time_type= MYSQL_TIMESTAMP_DATE;
-
-  int unused;
-  if (check_date(ltime, fuzzy_date, &unused))
-  {
-    Lazy_string_time str(ltime);
-    make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
-                                 &str, MYSQL_TIMESTAMP_DATE, 0);
-    return (null_value= 1);
-  }
-  return (null_value= 0);
+  return (null_value= check_date_with_warn(ltime, fuzzy_date,
+                                           MYSQL_TIMESTAMP_DATE));
 }
 
 

sql/mysql_priv.h

@@ -2568,6 +2568,8 @@ check_date(const MYSQL_TIME *ltime, ulonglong flags, int *was_cut)
 {
   return check_date(ltime, non_zero_date(ltime), flags, was_cut);
 }
+bool check_date_with_warn(const MYSQL_TIME *ltime, uint fuzzy_date,
+                          timestamp_type ts_type);
 int test_if_number(char *str,int *res,bool allow_wildcards);
 void change_byte(uchar *,uint,char,char);
 bool init_read_record(READ_RECORD *info, THD *thd, TABLE *reg_form,

sql/time.cc

@@ -213,6 +213,22 @@ ulong convert_month_to_period(ulong month)
 }
 
 
+bool
+check_date_with_warn(const MYSQL_TIME *ltime, uint fuzzy_date,
+                     timestamp_type ts_type)
+{
+  int dummy_warnings;
+  if (check_date(ltime, fuzzy_date, &dummy_warnings))
+  {
+    Lazy_string_time str(ltime);
+    make_truncated_value_warning(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
+                                 &str, MYSQL_TIMESTAMP_ERROR, 0);
+    return true;
+  }
+  return false;
+}
+
+
 /*
   Convert a timestamp string to a MYSQL_TIME value and produce a warning 
   if string was truncated during conversion.