Bug #59498 div function broken in mysql-trunk

Description:
mysql-trunk:

(gdb) bt
#0  __pthread_kill 
#1  in my_write_core (sig=11) at ./mysys/stacktrace.c:423
#2  in handle_segfault (sig=11) at ./sql/mysqld.cc:2511
#3  led>
#4  in my_decimal::my_decimal at ./sql/my_decimal.h:105
#5  in Item_func_int_div::val_int at ./sql/item_func.cc:1604
#6  in Item::send at ./sql/item.cc:5968
#7  in Protocol::send_result_set_row at ./sql/protocol.cc:848
#8  in select_send::send_data at ./sql/sql_class.cc:1866
#9  in JOIN::exec at ./sql/sql_select.cc:2794
#10 in mysql_select at ./sql/sql_select.cc:3554
#11 in handle_select at ./sql/sql_select.cc:323
#12 in execute_sqlcom_select at ./sql/sql_parse.cc:4513
#13 in mysql_execute_command at ./sql/sql_parse.cc:2096
#14 in mysql_parse at ./sql/sql_parse.cc:5550
#15 in dispatch_command at ./sql/sql_parse.cc:1078
#16 in do_command at ./sql/sql_parse.cc:815
#17 in do_handle_one_connection at ./sql/sql_connect.cc:748
#18 in handle_one_connection at ./sql/sql_connect.cc:684
#19 in start_thread at pthread_create.c:301
#20 in clone ()
(gdb) frame 4
#4  0x00000000007c28e8 in my_decimal::my_decimal (this=0x7f1a143fe360, rhs=...) at ./sql/my_decimal.h:105
105       my_decimal(const my_decimal &rhs) : decimal_t(rhs)
(gdb) p rhs
$1 = (const my_decimal &) @0x0: <error reading variable>

How to repeat:
#pull recent mysql-trunk and run:
select 1 div null;

Suggested fix:
review bug #59241 fix maybe?

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/128769

3248 Tor Didriksen	2011-01-14
      Bug #59498 div function broken in mysql-trunk
     @ mysql-test/r/func_math.result
        New test case.
     @ mysql-test/t/func_math.test
        New test case.
     @ sql/item_func.cc
        Check for null before converting value to my_decimal.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/128807

3249 Tor Didriksen	2011-01-14
      Bug #59498 div function broken in mysql-trunk
     @ mysql-test/r/func_math.result
        New test case.
     @ mysql-test/t/func_math.test
        New test case.
     @ sql/item_func.cc
        Check for null before converting value to my_decimal.

A patch for this bug has been committed. After review, it may
be pushed to the relevant source trees for release in the next
version. You can access the patch from:

  http://lists.mysql.com/commits/128813

3511 Tor Didriksen	2011-01-14 [merge]
      Merge Bug #59498 from 5.5

pushed to 5.5 and trunk

Pushed into mysql-trunk 5.6.2 (revid:tor.didriksen@oracle.com-20110114153619-qwbd2gu5pn0s6e3k) (version source revid:tor.didriksen@oracle.com-20110114153619-qwbd2gu5pn0s6e3k) (merge vers: 5.6.2) (pib:24)

Pushed into mysql-5.5 5.5.10 (revid:tor.didriksen@oracle.com-20110114140337-5zz3do0b12fxup3d) (version source revid:tor.didriksen@oracle.com-20110114140337-5zz3do0b12fxup3d) (merge vers: 5.5.10) (pib:24)

Bug does not appear in released versions. No changelog entry needed.

it's still broken in recent 5.5 and trunk.
select (1.175494351E-37 div 1.7976931348623157E+308);
i'm filing a new bug about it in oracle bugdb.

oracle bug 11792200