MDEV-5999 MySQL Bug#12766319 - 61865: RENAME USER DOES NOT WORK CORRECTLY -...

MDEV-5999 MySQL Bug#12766319 - 61865: RENAME USER DOES NOT WORK CORRECTLY - REQUIRES FLUSH PRIVILEGES

use update_hostname() to update the hostname.
test case comes from

  commit 0abdeed1d6d
  Author: gopal.shankar@oracle.com <>
  Date:   Thu Mar 29 00:20:54 2012 +0530

    Bug#12766319 - 61865: RENAME USER DOES NOT WORK CORRECTLY -
                          REQUIRES FLUSH PRIVILEGES

mysql-test/r/grant.result

@@ -2560,3 +2560,29 @@ Grants for mysqltest_u1@%
 GRANT USAGE ON *.* TO 'mysqltest_u1'@'%'
 drop database mysqltest_db1;
 drop user mysqltest_u1;
+#
+# Bug#12766319 - 61865: RENAME USER DOES NOT WORK CORRECTLY -
+#                       REQUIRES FLUSH PRIVILEGES
+#
+CREATE USER foo@'127.0.0.1';
+GRANT ALL ON *.* TO foo@'127.0.0.1';
+# First attempt, should connect successfully
+SELECT user(), current_user();
+user()	current_user()
+foo@localhost	foo@127.0.0.1
+# Rename the user
+RENAME USER foo@'127.0.0.1' to foo@'127.0.0.0/255.0.0.0';
+# Second attempt, should connect successfully as its valid mask
+# This was failing without fix
+SELECT user(), current_user();
+user()	current_user()
+foo@localhost	foo@127.0.0.0/255.0.0.0
+# Rename the user back to original
+RENAME USER foo@'127.0.0.0/255.0.0.0' to foo@'127.0.0.1';
+# Third attempt, should connect successfully
+SELECT user(), current_user();
+user()	current_user()
+foo@localhost	foo@127.0.0.1
+# Clean-up
+DROP USER foo@'127.0.0.1';
+# End of Bug#12766319

mysql-test/t/grant.test

@@ -2211,3 +2211,43 @@ grant select on mysqltest_db1.t1 to mysqltest_u1;
 show grants for mysqltest_u1;
 drop database mysqltest_db1;
 drop user mysqltest_u1;
+
+
+--echo #
+--echo # Bug#12766319 - 61865: RENAME USER DOES NOT WORK CORRECTLY -
+--echo #                       REQUIRES FLUSH PRIVILEGES
+--echo #
+
+CREATE USER foo@'127.0.0.1';
+GRANT ALL ON *.* TO foo@'127.0.0.1';
+
+--echo # First attempt, should connect successfully
+connect (conn1, '127.0.0.1', foo,,test);
+SELECT user(), current_user();
+
+--echo # Rename the user
+RENAME USER foo@'127.0.0.1' to foo@'127.0.0.0/255.0.0.0';
+
+--echo # Second attempt, should connect successfully as its valid mask
+--echo # This was failing without fix
+connect (conn2, '127.0.0.1', foo,,test);
+SELECT user(), current_user();
+
+--echo # Rename the user back to original
+RENAME USER foo@'127.0.0.0/255.0.0.0' to foo@'127.0.0.1';
+
+--echo # Third attempt, should connect successfully
+connect (conn3, '127.0.0.1', foo,,test);
+SELECT user(), current_user();
+
+--echo # Clean-up
+connection default;
+disconnect conn1;
+disconnect conn2;
+disconnect conn3;
+DROP USER foo@'127.0.0.1';
+
+--echo # End of Bug#12766319
+
+# Wait till we reached the initial number of concurrent sessions
+--source include/wait_until_count_sessions.inc

sql/sql_acl.cc

@@ -6285,12 +6285,12 @@ static int handle_grant_struct(enum enum_acl_lists struct_no, bool drop,
       switch ( struct_no ) {
       case USER_ACL:
         acl_user->user= strdup_root(&mem, user_to->user.str);
-        acl_user->host.hostname= strdup_root(&mem, user_to->host.str);
+        update_hostname(&acl_user->host, strdup_root(&mem, user_to->host.str));
         break;
 
       case DB_ACL:
         acl_db->user= strdup_root(&mem, user_to->user.str);
-        acl_db->host.hostname= strdup_root(&mem, user_to->host.str);
+        update_hostname(&acl_db->host, strdup_root(&mem, user_to->host.str));
         break;
 
       case COLUMN_PRIVILEGES_HASH: