Bug#33619511: MySQL server exits in debug build when -p parameter used

Fixes server exit due to uninitialized variables in keyring migration code.

Approved by: Harin Vadodaria <harin.vadodaria@oracle.com>

Change-Id: I05bf3dfd059140c4c1ac0e14a9260e51f5a40ca8

Author: MRajcic

mysql-test/r/keyring_migration_password.result

@@ -0,0 +1,5 @@
+#
+# Bug#33619511: MySQL server exits in debug build when -p parameter used
+#
+# Expect log that proves the server clean exit
+Pattern "\[ERROR\] \[MY-[0-9]+] \[Server\] Aborting" found

mysql-test/t/keyring_migration_password.test

@@ -0,0 +1,43 @@
+
+# Checking if perl Expect module is installed on the system.
+# If not, the test will be skipped.
+--source include/have_expect.inc
+--source include/not_windows.inc
+
+--echo #
+--echo # Bug#33619511: MySQL server exits in debug build when -p parameter used
+--echo #
+
+# No $ sign before the name to make it visible in Perl code below
+--let MYSQLD_ARGS = --datadir=$MYSQLD_DATADIR --secure-file-priv="" -p
+--let MYSQLD_LOG = $MYSQL_TMP_DIR/bug33619511_log.txt
+
+# Start a custom mysqld instance and interactively fill up the dummy password.
+# Server should exit with "[Server] Aborting"
+--perl
+
+use strict;
+require Expect;
+
+# 1. Start the server
+# The server should enter password prompt, we'll type a password 'a'.
+# Use "log_stdout(0)" to avoid leaking output to record file because it contains timestamps and custom paths.
+my $texp = new Expect();
+$texp->raw_pty(1);
+$texp->log_stdout(0);
+$texp->log_file("$ENV{MYSQLD_LOG}", "w");
+$texp->spawn("$ENV{MYSQLD} $ENV{MYSQLD_ARGS}");
+$texp->expect(15,' -re ',[ 'Enter password:' => sub {
+    $texp->send("a\n");}]) or die "Error sending the password";
+
+$texp->soft_close();
+
+EOF
+
+--echo # Expect log that proves the server clean exit
+--let SEARCH_FILE = $MYSQLD_LOG
+--let SEARCH_PATTERN=\[ERROR\] \[MY-[0-9]+] \[Server\] Aborting
+--source include/search_pattern.inc
+
+# Cleanup
+--remove_file $MYSQLD_LOG

sql/migrate_keyring.cc

@@ -37,6 +37,8 @@ Migrate_keyring::Migrate_keyring()
   m_source_plugin_handle= NULL;
   m_destination_plugin_handle= NULL;
   mysql= NULL;
+  m_argc = 0;
+  m_argv = nullptr;
 }
 
 /**