From 607fc153939fd6314dcde60d565cfd20676a01f9 Mon Sep 17 00:00:00 2001
From: Alexander Barkov <bar@mariadb.com>
Date: Fri, 20 Sep 2024 14:10:27 +0400
Subject: [PATCH] MDEV-31302 Assertion `mon > 0 && mon < 13' failed in
 my_time_t sec_since_epoch(int, int, int, int, int, int)

The code erroneously called sec_since_epoch() for dates with zeros,
e.g. '2024-00-01'.
Fixi: adding a test that the date does not have zeros before
calling TIME_to_native().
---
 mysql-test/main/func_time.result | 11 +++++++++++
 mysql-test/main/func_time.test   | 11 +++++++++++
 sql/sql_type.cc                  |  1 +
 3 files changed, 23 insertions(+)

diff --git a/mysql-test/main/func_time.result b/mysql-test/main/func_time.result
index eaf30f5f925..3982342b4c5 100644
--- a/mysql-test/main/func_time.result
+++ b/mysql-test/main/func_time.result
@@ -6425,5 +6425,16 @@ Warning	1292	Truncated incorrect time value: '8390000'
 Warning	1292	Truncated incorrect time value: '8390000'
 SET @@timestamp= DEFAULT;
 #
+# MDEV-31302 Assertion `mon > 0 && mon < 13' failed in my_time_t sec_since_epoch(int, int, int, int, int, int)
+#
+CREATE TABLE t1 (a DATE);
+SET @@time_zone='+1:00';
+INSERT INTO t1 VALUES ('2024-00-01');
+SELECT UNIX_TIMESTAMP(MAX(a)) AS a FROM t1;
+a
+NULL
+SET @@time_zone=DEFAULT;
+DROP TABLE t1;
+#
 # End of 10.5 tests
 #
diff --git a/mysql-test/main/func_time.test b/mysql-test/main/func_time.test
index 51b2722d7a0..25a7e31b54d 100644
--- a/mysql-test/main/func_time.test
+++ b/mysql-test/main/func_time.test
@@ -3262,6 +3262,17 @@ SELECT
 
 SET @@timestamp= DEFAULT;
 
+--echo #
+--echo # MDEV-31302 Assertion `mon > 0 && mon < 13' failed in my_time_t sec_since_epoch(int, int, int, int, int, int)
+--echo #
+
+CREATE TABLE t1 (a DATE);
+SET @@time_zone='+1:00';
+INSERT INTO t1 VALUES ('2024-00-01');
+SELECT UNIX_TIMESTAMP(MAX(a)) AS a FROM t1;
+SET @@time_zone=DEFAULT;
+DROP TABLE t1;
+
 --echo #
 --echo # End of 10.5 tests
 --echo #
diff --git a/sql/sql_type.cc b/sql/sql_type.cc
index 44475e29bcc..98abf154db4 100644
--- a/sql/sql_type.cc
+++ b/sql/sql_type.cc
@@ -9182,6 +9182,7 @@ Type_handler_timestamp_common::Item_val_native_with_conversion(THD *thd,
   Datetime dt(thd, item, Datetime::Options(TIME_NO_ZERO_IN_DATE, thd));
   return
     !dt.is_valid_datetime() ||
+    dt.check_date(TIME_NO_ZERO_IN_DATE | TIME_NO_ZERO_DATE) ||
     TIME_to_native(thd, dt.get_mysql_time(), to, item->datetime_precision(thd));
 }