MDEV-11584: GRANT inside an SP does not work well on 2nd execution

Allocate password hash in statment memory

mysql-test/r/sp.result

@@ -8040,3 +8040,12 @@ v_name	v_total
 c	1
 DROP PROCEDURE p1;
 DROP TABLE t1;
+#
+# MDEV-11584: GRANT inside an SP does not work well on 2nd execution
+#
+CREATE PROCEDURE sp1()
+GRANT ALL PRIVILEGES ON *.* TO 'foo'@'%' IDENTIFIED BY 'pass';
+CALL sp1();
+CALL sp1();
+drop user 'foo'@'%';
+drop procedure sp1;

mysql-test/t/sp.test

@@ -9484,3 +9484,14 @@ CALL p1();
 DROP PROCEDURE p1;
 DROP TABLE t1;
 
+
+--echo #
+--echo # MDEV-11584: GRANT inside an SP does not work well on 2nd execution
+--echo #
+
+CREATE PROCEDURE sp1()
+  GRANT ALL PRIVILEGES ON *.* TO 'foo'@'%' IDENTIFIED BY 'pass';
+CALL sp1();
+CALL sp1();
+drop user 'foo'@'%';
+drop procedure sp1;

sql/sql_acl.cc

@@ -1064,7 +1064,12 @@ static bool fix_lex_user(THD *thd, LEX_USER *user)
       make_scramble= my_make_scrambled_password;
     }
 
+    Query_arena *arena, backup;
+    arena= thd->activate_stmt_arena_if_needed(&backup);
     char *buff= (char *) thd->alloc(scramble_length + 1);
+    if (arena)
+      thd->restore_active_arena(arena, &backup);
+
     if (buff == NULL)
       return true;
     make_scramble(buff, user->pwtext.str, user->pwtext.length);