re-commit of bug #12818542: PAM: ADDING PASSWORD FOR AN ACCOUNT DISABLES

  PAM AUTHENTICATION SETTINGS
to the release clone.

mysql-test/r/plugin_auth.result

@@ -44,7 +44,7 @@ ERROR 28000: Access denied for user 'plug'@'localhost' (using password: YES)
 ## test correct default plugin
 select USER(),CURRENT_USER();
 USER()	CURRENT_USER()
-plug@localhost	plug@%
+plug@localhost	plug_dest@%
 ## test no_auto_create_user sql mode with plugin users
 SET @@sql_mode=no_auto_create_user;
 GRANT INSERT ON TEST.* TO grant_user IDENTIFIED WITH 'test_plugin_server';
@@ -462,4 +462,24 @@ CREATE USER bug12610784@localhost;
 SET PASSWORD FOR bug12610784@localhost = PASSWORD('secret');
 ERROR 28000: Access denied for user 'bug12610784'@'localhost' (using password: NO)
 DROP USER bug12610784@localhost;
+#
+# Bug #12818542: PAM: ADDING PASSWORD FOR AN ACCOUNT DISABLES PAM 
+#   AUTHENTICATION SETTINGS
+#
+CREATE USER bug12818542@localhost 
+IDENTIFIED WITH 'test_plugin_server' AS 'bug12818542_dest';
+CREATE USER bug12818542_dest@localhost 
+IDENTIFIED BY 'bug12818542_dest_passwd';
+GRANT PROXY ON bug12818542_dest@localhost TO bug12818542@localhost;
+SELECT USER(),CURRENT_USER();
+USER()	CURRENT_USER()
+bug12818542@localhost	bug12818542_dest@localhost
+SET PASSWORD = PASSWORD('bruhaha');
+Warnings:
+Note	1699	SET PASSWORD has no significance for users authenticating via plugins
+SELECT USER(),CURRENT_USER();
+USER()	CURRENT_USER()
+bug12818542@localhost	bug12818542_dest@localhost
+DROP USER bug12818542@localhost;
+DROP USER bug12818542_dest@localhost;
 End of 5.5 tests

mysql-test/t/plugin_auth.test

@@ -540,4 +540,35 @@ connection default;
 disconnect b12610784;
 DROP USER bug12610784@localhost;
 
+
+--echo #
+--echo # Bug #12818542: PAM: ADDING PASSWORD FOR AN ACCOUNT DISABLES PAM 
+--echo #   AUTHENTICATION SETTINGS
+--echo #
+
+CREATE USER bug12818542@localhost 
+  IDENTIFIED WITH 'test_plugin_server' AS 'bug12818542_dest';
+CREATE USER bug12818542_dest@localhost 
+  IDENTIFIED BY 'bug12818542_dest_passwd';
+GRANT PROXY ON bug12818542_dest@localhost TO bug12818542@localhost;
+
+connect(bug12818542_con,localhost,bug12818542,bug12818542_dest);
+connection bug12818542_con;
+SELECT USER(),CURRENT_USER();
+
+SET PASSWORD = PASSWORD('bruhaha');
+
+connection default;
+disconnect bug12818542_con;
+
+connect(bug12818542_con2,localhost,bug12818542,bug12818542_dest);
+connection bug12818542_con2;
+SELECT USER(),CURRENT_USER();
+
+connection default;
+disconnect bug12818542_con2;
+
+DROP USER bug12818542@localhost;
+DROP USER bug12818542_dest@localhost;
+
 --echo End of 5.5 tests

sql/sql_acl.cc

@@ -1881,16 +1881,16 @@ bool change_password(THD *thd, const char *host, const char *user,
     goto end;
   }
 
+  /* update loaded acl entry: */
+  set_user_salt(acl_user, new_password, new_password_len);
+
   if (my_strcasecmp(system_charset_info, acl_user->plugin.str,
                     native_password_plugin_name.str) &&
       my_strcasecmp(system_charset_info, acl_user->plugin.str,
                     old_password_plugin_name.str))
-  {
     push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
                  ER_SET_PASSWORD_AUTH_PLUGIN, ER(ER_SET_PASSWORD_AUTH_PLUGIN));
-  }
-  /* update loaded acl entry: */
-  set_user_salt(acl_user, new_password, new_password_len);
+  else
     set_user_plugin(acl_user, new_password_len);
 
   if (update_user_table(thd, table,