sql_show.cc:

  Database name was set incorrectly for any show command
  that used sunqueries in its where condition.
information_schema.test, information_schema.result:
  Added a test case for bug #12636.

mysql-test/r/information_schema.result

@@ -967,3 +967,11 @@ a	NULL
 b	NULL
 use test;
 drop table t1;
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (b int);
+SHOW TABLE STATUS FROM test
+WHERE name IN ( SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
+WHERE TABLE_SCHEMA='test' AND TABLE_TYPE='BASE TABLE');
+Name	Engine	Version	Row_format	Rows	Avg_row_length	Data_length	Max_data_length	Index_length	Data_free	Auto_increment	Create_time	Update_time	Check_time	Collation	Checksum	Create_options	Comment
+t1	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		
+t2	MyISAM	10	Fixed	0	0	0	#	1024	0	NULL	#	#	NULL	latin1_swedish_ci	NULL		

mysql-test/t/information_schema.test

@@ -650,3 +650,18 @@ select column_name, column_default from columns
   where table_schema='test' and table_name='t1';
 use test;
 drop table t1;
+
+#
+# Bug #12636: SHOW TABLE STATUS with where condition containing a subquery
+#             over information schema
+#
+
+CREATE TABLE t1 (a int);
+CREATE TABLE t2 (b int);
+
+--replace_column 8 # 12 # 13 #
+SHOW TABLE STATUS FROM test
+  WHERE name IN ( SELECT TABLE_NAME FROM INFORMATION_SCHEMA.TABLES
+                    WHERE TABLE_SCHEMA='test' AND TABLE_TYPE='BASE TABLE');
+
+DROP TABLE t1,t2

sql/sql_show.cc

@@ -1705,7 +1705,7 @@ void get_index_field_values(LEX *lex, INDEX_FIELD_VALUES *index_field_values)
   case SQLCOM_SHOW_TABLES:
   case SQLCOM_SHOW_TABLE_STATUS:
   case SQLCOM_SHOW_TRIGGERS:
-    index_field_values->db_value= lex->current_select->db;
+    index_field_values->db_value= lex->select_lex.db;
     index_field_values->table_value= wild;
     break;
   default: