Update after merge to 5.0

mysql-test/r/grant.result:
  Reorder test result
mysql-test/t/grant.test:
  Add "use test"
sql/sql_acl.cc:
  Add check if host is NULL
  Add check if grant_name->host.hostname is null

mysql-test/r/grant.result

@@ -624,6 +624,25 @@ GRANT USAGE ON *.* TO 'mysqltest_7'@'' IDENTIFIED BY PASSWORD '*2FB071A056F9BB74
 drop user mysqltest_7@;
 show grants for mysqltest_7@;
 ERROR 42000: There is no such grant defined for user 'mysqltest_7' on host ''
+create database mysqltest;
+use mysqltest;
+create table t1(f1 int);
+GRANT DELETE ON mysqltest.t1 TO mysqltest1@'%';
+GRANT SELECT ON mysqltest.t1 TO mysqltest1@'192.%';
+show grants for mysqltest1@'192.%';
+Grants for mysqltest1@192.%
+GRANT USAGE ON *.* TO 'mysqltest1'@'192.%'
+GRANT SELECT ON `mysqltest`.`t1` TO 'mysqltest1'@'192.%'
+show grants for mysqltest1@'%';
+Grants for mysqltest1@%
+GRANT USAGE ON *.* TO 'mysqltest1'@'%'
+GRANT DELETE ON `mysqltest`.`t1` TO 'mysqltest1'@'%'
+delete from mysql.user where user='mysqltest1';
+delete from mysql.db where user='mysqltest1';
+delete from mysql.tables_priv where user='mysqltest1';
+flush privileges;
+drop database mysqltest;
+use test;
 create table t1 (a int);
 create table t2 as select * from mysql.user where user='';
 delete from mysql.user where user='';
@@ -834,21 +853,3 @@ insert into mysql.user select * from t2;
 flush privileges;
 drop table t2;
 drop table t1;
-create database mysqltest;
-use mysqltest;
-create table t1(f1 int);
-GRANT DELETE ON mysqltest.t1 TO mysqltest1@'%';
-GRANT SELECT ON mysqltest.t1 TO mysqltest1@'192.%';
-show grants for mysqltest1@'192.%';
-Grants for mysqltest1@192.%
-GRANT USAGE ON *.* TO 'mysqltest1'@'192.%'
-GRANT SELECT ON `mysqltest`.`t1` TO 'mysqltest1'@'192.%'
-show grants for mysqltest1@'%';
-Grants for mysqltest1@%
-GRANT USAGE ON *.* TO 'mysqltest1'@'%'
-GRANT DELETE ON `mysqltest`.`t1` TO 'mysqltest1'@'%'
-delete from mysql.user where user='mysqltest1';
-delete from mysql.db where user='mysqltest1';
-delete from mysql.tables_priv where user='mysqltest1';
-flush privileges;
-drop database mysqltest;

mysql-test/t/grant.test

@@ -532,7 +532,7 @@ drop database mysqltest;
 #
 # Bug #16297 In memory grant tables not flushed when users's hostname is ""
 #
-
+use test;
 create table t1 (a int);
 
 # Backup anonymous users and remove them. (They get in the way of

sql/sql_acl.cc

@@ -2273,7 +2273,8 @@ static GRANT_NAME *name_hash_search(HASH *name_hash,
   {
     if (exact)
     {
-      if ((host &&
+      if (!grant_name->host.hostname ||
+          (host &&
 	   !my_strcasecmp(system_charset_info, host,
                           grant_name->host.hostname)) ||
 	  (ip && !strcmp(ip, grant_name->host.hostname)))
@@ -4956,6 +4957,9 @@ static int handle_grant_struct(uint struct_no, bool drop,
     }
     if (! user)
       user= "";
+    if (! host)
+      host= "";
+
 #ifdef EXTRA_DEBUG
     DBUG_PRINT("loop",("scan struct: %u  index: %u  user: '%s'  host: '%s'",
                        struct_no, idx, user, host));