Bug#44798 MySQL engine crashes when creating stored procedures with execute_priv=N

The crash happens because of uninitialized
lex->ssl_cipher, lex->x509_subject, lex->x509_issuer variables.
The fix is to add initialization of these variables for
stored procedures&functions.

mysql-test/r/sp_notembedded.result

@@ -219,3 +219,10 @@ GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' WITH GRANT OPTION
 drop user mysqltest_1@localhost;
 drop procedure 15298_1;
 drop procedure 15298_2;
+INSERT INTO mysql.user (Host, User, Password, Select_priv, Insert_priv, Update_priv, Delete_priv, Create_priv, Drop_priv, Reload_priv, Shutdown_priv, Process_priv, File_priv, Grant_priv, References_priv, Index_priv, Alter_priv, Show_db_priv, Super_priv, Create_tmp_table_priv, Lock_tables_priv, Execute_priv, Repl_slave_priv, Repl_client_priv, Create_view_priv, Show_view_priv, Create_routine_priv, Alter_routine_priv, Create_user_priv, ssl_type, ssl_cipher, x509_issuer, x509_subject, max_questions, max_updates, max_connections, max_user_connections) 
+VALUES('%', 'mysqltest_1', password(''), 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'N', 'N', 'N', 'N', 'N', 'N', 'Y', 'Y', 'N', 'N', 'Y', 'Y', 'N', 'N', 'N', 'N', 'N', 'Y', 'Y', 'N', '', '', '', '', '0', '0', '0', '0');
+FLUSH PRIVILEGES;
+CREATE PROCEDURE p1(i INT) BEGIN END;
+DROP PROCEDURE p1;
+DELETE FROM mysql.user WHERE User='mysqltest_1';
+FLUSH PRIVILEGES;

mysql-test/t/sp_notembedded.test

@@ -292,6 +292,23 @@ drop user mysqltest_1@localhost;
 drop procedure 15298_1;
 drop procedure 15298_2;
 
+#
+# Bug#44798 MySQL engine crashes when creating stored procedures with execute_priv=N
+#
+INSERT INTO mysql.user (Host, User, Password, Select_priv, Insert_priv, Update_priv, Delete_priv, Create_priv, Drop_priv, Reload_priv, Shutdown_priv, Process_priv, File_priv, Grant_priv, References_priv, Index_priv, Alter_priv, Show_db_priv, Super_priv, Create_tmp_table_priv, Lock_tables_priv, Execute_priv, Repl_slave_priv, Repl_client_priv, Create_view_priv, Show_view_priv, Create_routine_priv, Alter_routine_priv, Create_user_priv, ssl_type, ssl_cipher, x509_issuer, x509_subject, max_questions, max_updates, max_connections, max_user_connections) 
+VALUES('%', 'mysqltest_1', password(''), 'Y', 'Y', 'Y', 'Y', 'Y', 'Y', 'N', 'N', 'N', 'N', 'N', 'N', 'Y', 'Y', 'N', 'N', 'Y', 'Y', 'N', 'N', 'N', 'N', 'N', 'Y', 'Y', 'N', '', '', '', '', '0', '0', '0', '0');
+FLUSH PRIVILEGES;
+
+connect (con1, localhost, mysqltest_1,,);
+connection con1;
+CREATE PROCEDURE p1(i INT) BEGIN END;
+disconnect con1;
+connection default;
+DROP PROCEDURE p1;
+
+DELETE FROM mysql.user WHERE User='mysqltest_1';
+FLUSH PRIVILEGES;
+
 # Wait till all disconnects are completed
 --source include/wait_until_count_sessions.inc
 

sql/sql_acl.cc

@@ -5911,6 +5911,7 @@ int sp_grant_privileges(THD *thd, const char *sp_db, const char *sp_name,
     DBUG_RETURN(TRUE);
 
   thd->lex->ssl_type= SSL_TYPE_NOT_SPECIFIED;
+  thd->lex->ssl_cipher= thd->lex->x509_subject= thd->lex->x509_issuer= 0;
   bzero((char*) &thd->lex->mqh, sizeof(thd->lex->mqh));
 
   result= mysql_routine_grant(thd, tables, is_proc, user_list,