Merge branch '10.1' into 10.2

MDEV-18046: Assortment of crashes, assertion failures and ASAN errors in mysql_show_binlog_events

Problem:
========
SHOW BINLOG EVENTS FROM <pos> reports following assert when ASAN is enabled.

uint32 binlog_get_uncompress_len(const char*):
  Assertion `(buf[0] & 0xe0) == 0x80' failed

Fix:
===
**Part11: Converted debug assert to error handler code**

6 files changed, 125 insertions, 0 deletions

diff --git a/mysql-test/suite/binlog/r/binlog_invalid_read_in_rotate.result b/mysql-test/suite/binlog/r/binlog_invalid_read_in_rotate.result
new file mode 100644
index 00000000000..442fc951289
--- /dev/null
+++ b/mysql-test/suite/binlog/r/binlog_invalid_read_in_rotate.result
@@ -0,0 +1,18 @@
+RESET MASTER;
+call mtr.add_suppression("Error in Log_event::read_log_event*");
+call mtr.add_suppression("Replication event checksum verification failed while reading from a log file*");
+DROP TABLE /*! IF EXISTS*/ t1;
+Warnings:
+Note	1051	Unknown table 'test.t1'
+CREATE TABLE `t1` (
+`col_int` int,
+pk integer auto_increment,
+`col_char_12_key` char(12),
+`col_int_key` int,
+`col_char_12` char(12),
+primary key (pk),
+key (`col_char_12_key` ),
+key (`col_int_key` )) ENGINE=InnoDB;
+INSERT /*! IGNORE */ INTO t1 VALUES  (183173120, NULL, 'abcd', 1, 'efghijk'),  (1, NULL, 'lmno', 2, 'p');
+ALTER TABLE `t1` ENABLE KEYS;
+DROP TABLE t1;
diff --git a/mysql-test/suite/binlog/r/binlog_show_binlog_event_random_pos.result b/mysql-test/suite/binlog/r/binlog_show_binlog_event_random_pos.result
new file mode 100644
index 00000000000..358422c5842
--- /dev/null
+++ b/mysql-test/suite/binlog/r/binlog_show_binlog_event_random_pos.result
@@ -0,0 +1,12 @@
+RESET MASTER;
+call mtr.add_suppression("Error in Log_event::read_log_event*");
+call mtr.add_suppression("Replication event checksum verification failed while reading from a log file*");
+DROP TABLE IF EXISTS t1;
+Warnings:
+Note	1051	Unknown table 'test.t1'
+CREATE TABLE t1 (c1 CHAR(255), c2 CHAR(255), c3 CHAR(255), c4 CHAR(255), c5 CHAR(255));
+INSERT INTO t1 VALUES (repeat('a', 255), repeat('a', 255),repeat('a', 255),repeat('a', 255),repeat('a', 255));
+INSERT INTO t1 VALUES (repeat('a', 255), repeat('a', 255),repeat('a', 255),repeat('a', 255),repeat('a', 255));
+UPDATE t1 SET c1=repeat('b',255);
+INSERT INTO t1 VALUES (repeat('a', 255), repeat('a', 255),repeat('a', 255),repeat('a', 255),repeat('a', 255));
+DROP TABLE t1;
diff --git a/mysql-test/suite/binlog/t/binlog_invalid_read_in_rotate.combinations b/mysql-test/suite/binlog/t/binlog_invalid_read_in_rotate.combinations
new file mode 100644
index 00000000000..72076e12d48
--- /dev/null
+++ b/mysql-test/suite/binlog/t/binlog_invalid_read_in_rotate.combinations
@@ -0,0 +1,5 @@
+[enable_checksum]
+binlog_checksum=1
+
+[disable_checksum]
+binlog_checksum=0
diff --git a/mysql-test/suite/binlog/t/binlog_invalid_read_in_rotate.test b/mysql-test/suite/binlog/t/binlog_invalid_read_in_rotate.test
new file mode 100644
index 00000000000..36bb56c8342
--- /dev/null
+++ b/mysql-test/suite/binlog/t/binlog_invalid_read_in_rotate.test
@@ -0,0 +1,48 @@
+# ==== Purpose ====
+#
+# Test verifies that reading binary log by using "SHOW BINLOG EVENTS" command
+# from various random positions doesn't lead to crash. It should exit
+# gracefully with appropriate error.
+#
+# ==== References ====
+#
+# MDEV-18046:Assortment of crashes, assertion failures and ASAN errors in mysql_show_binlog_events
+
+--source include/have_log_bin.inc
+--source include/have_innodb.inc
+
+RESET MASTER;
+
+call mtr.add_suppression("Error in Log_event::read_log_event*");
+call mtr.add_suppression("Replication event checksum verification failed while reading from a log file*");
+
+DROP TABLE /*! IF EXISTS*/ t1;
+CREATE TABLE `t1` (
+`col_int` int,
+pk integer auto_increment,
+`col_char_12_key` char(12),
+`col_int_key` int,
+`col_char_12` char(12),
+primary key (pk),
+key (`col_char_12_key` ),
+key (`col_int_key` )) ENGINE=InnoDB;
+
+INSERT /*! IGNORE */ INTO t1 VALUES  (183173120, NULL, 'abcd', 1, 'efghijk'),  (1, NULL, 'lmno', 2, 'p');
+
+--disable_warnings
+ALTER TABLE `t1` ENABLE KEYS;
+--enable_warnings
+
+--let $max_pos= query_get_value(SHOW MASTER STATUS,Position,1)
+--let $pos= 1
+while ($pos <= $max_pos)
+{
+  --disable_query_log
+  --disable_result_log
+  --error 0,1220
+  eval SHOW BINLOG EVENTS FROM $pos;
+  --inc $pos
+  --enable_result_log
+  --enable_query_log
+}
+DROP TABLE t1;
diff --git a/mysql-test/suite/binlog/t/binlog_show_binlog_event_random_pos.combinations b/mysql-test/suite/binlog/t/binlog_show_binlog_event_random_pos.combinations
new file mode 100644
index 00000000000..72076e12d48
--- /dev/null
+++ b/mysql-test/suite/binlog/t/binlog_show_binlog_event_random_pos.combinations
@@ -0,0 +1,5 @@
+[enable_checksum]
+binlog_checksum=1
+
+[disable_checksum]
+binlog_checksum=0
diff --git a/mysql-test/suite/binlog/t/binlog_show_binlog_event_random_pos.test b/mysql-test/suite/binlog/t/binlog_show_binlog_event_random_pos.test
new file mode 100644
index 00000000000..e6a9e1cb2c1
--- /dev/null
+++ b/mysql-test/suite/binlog/t/binlog_show_binlog_event_random_pos.test
@@ -0,0 +1,37 @@
+# ==== Purpose ====
+#
+# Test verifies that reading binary log by using "SHOW BINLOG EVENTS" command
+# from various random positions doesn't lead to crash. It should exit
+# gracefully with appropriate error.
+#
+# ==== References ====
+#
+# MDEV-18046:Assortment of crashes, assertion failures and ASAN errors in mysql_show_binlog_events
+
+--source include/have_log_bin.inc
+--source include/have_innodb.inc
+
+RESET MASTER;
+call mtr.add_suppression("Error in Log_event::read_log_event*");
+call mtr.add_suppression("Replication event checksum verification failed while reading from a log file*");
+
+DROP TABLE IF EXISTS t1;
+CREATE TABLE t1 (c1 CHAR(255), c2 CHAR(255), c3 CHAR(255), c4 CHAR(255), c5 CHAR(255));
+INSERT INTO t1 VALUES (repeat('a', 255), repeat('a', 255),repeat('a', 255),repeat('a', 255),repeat('a', 255));
+INSERT INTO t1 VALUES (repeat('a', 255), repeat('a', 255),repeat('a', 255),repeat('a', 255),repeat('a', 255));
+UPDATE t1 SET c1=repeat('b',255);
+INSERT INTO t1 VALUES (repeat('a', 255), repeat('a', 255),repeat('a', 255),repeat('a', 255),repeat('a', 255));
+--let $max_pos= query_get_value(SHOW MASTER STATUS,Position,1)
+--let $pos= 1
+while ($pos <= $max_pos)
+{
+  --disable_query_log
+  --disable_result_log
+  --error 0,1220
+  eval SHOW BINLOG EVENTS FROM $pos LIMIT 100;
+  --inc $pos
+  --enable_result_log
+  --enable_query_log
+}
+
+DROP TABLE t1;