Fix for bug #27515: DROP previlege is not required anymore for RENAME TABLE

Added missed DROP privilege check on the original table for RENAME TABLE command.

mysql-test/r/grant.result

@@ -492,3 +492,14 @@ delete from mysql.db where user='mysqltest1';
 delete from mysql.tables_priv where user='mysqltest1';
 flush privileges;
 drop database mysqltest;
+create database db27515;
+use db27515;
+create table t1 (a int);
+grant alter on db27515.t1 to user27515@localhost;
+grant insert, create on db27515.t2 to user27515@localhost;
+rename table t1 to t2;
+ERROR 42000: DROP command denied to user 'user27515'@'localhost' for table 't1'
+revoke all privileges, grant option from user27515@localhost;
+drop user user27515@localhost;
+drop database db27515;
+End of 4.1 tests

mysql-test/t/grant.test

@@ -451,4 +451,25 @@ delete from mysql.tables_priv where user='mysqltest1';
 flush privileges;
 drop database mysqltest;
 
-# End of 4.1 tests
+#
+# Bug #27515: DROP previlege is not required for RENAME TABLE
+#
+connection master;
+create database db27515;
+use db27515;
+create table t1 (a int);
+grant alter on db27515.t1 to user27515@localhost;
+grant insert, create on db27515.t2 to user27515@localhost;
+
+connect (conn27515, localhost, user27515, , db27515);
+connection conn27515;
+--error 1142
+rename table t1 to t2;
+disconnect conn27515;
+
+connection master;
+revoke all privileges, grant option from user27515@localhost;
+drop user user27515@localhost;
+drop database db27515;
+
+--echo End of 4.1 tests

sql/sql_parse.cc

@@ -2818,7 +2818,7 @@ mysql_execute_command(THD *thd)
 	old_list=table[0];
 	new_list=table->next[0];
 	old_list.next=new_list.next=0;
-	if (check_grant(thd, ALTER_ACL, &old_list, 0, UINT_MAX, 0) ||
+	if (check_grant(thd, ALTER_ACL | DROP_ACL, &old_list, 0, UINT_MAX, 0) ||
 	    (!test_all_bits(table->next->grant.privilege,
 			    INSERT_ACL | CREATE_ACL) &&
 	     check_grant(thd, INSERT_ACL | CREATE_ACL, &new_list, 0,