LP:1058071 - crash with small join_buffer_size

Version: '5.5.27-MariaDB' socket: '' port: 3306 MariaDB Server
120928 13:40:55 [ERROR] mysqld got exception 0xc0000005 ;

mysqld.exe!memcpy()[memcpy.asm:173]
mysqld.exe!JOIN_CACHE::read_record_field()[sql_join_cache.cc:1837]
mysqld.exe!JOIN_CACHE::read_all_record_fields()[sql_join_cache.cc:1718]
mysqld.exe!JOIN_CACHE::get_record_by_pos()[sql_join_cache.cc:1619]
mysqld.exe!JOIN_CACHE::get_record()[sql_join_cache.cc:1592]
mysqld.exe!JOIN_CACHE::join_matching_records()[sql_join_cache.cc:2268]
mysqld.exe!JOIN_CACHE::join_records()[sql_join_cache.cc:2065]
mysqld.exe!JOIN_CACHE::join_records()[sql_join_cache.cc:2079]
mysqld.exe!sub_select_cache()[sql_select.cc:15883]
mysqld.exe!do_select()[sql_select.cc:15763]
mysqld.exe!JOIN::exec()[sql_select.cc:2397]
mysqld.exe!mysql_select()[sql_select.cc:3055]
mysqld.exe!handle_select()[sql_select.cc:316]
mysqld.exe!execute_sqlcom_select()[sql_parse.cc:4615]
mysqld.exe!mysql_execute_command()[sql_parse.cc:2182]
mysqld.exe!mysql_parse()[sql_parse.cc:5735]
mysqld.exe!dispatch_command()[sql_parse.cc:1058]
mysqld.exe!do_command()[sql_parse.cc:794]
mysqld.exe!threadpool_process_request()[threadpool_common.cc:225]
mysqld.exe!io_completion_callback()[threadpool_win.cc:584]

D:\ade\build\bzr\maria-5.5>bzr revno
3542

Attached testcase. Might have to run mysqld in valgrind.