Description:
------------
ldap_explode_dn crashes apache if not correct parameter is given to function. This fix to applied ldap.c did not crash anymore:

*** ext/ldap/ldap.c.old 2003-09-13 17:52:40.000000000 +0300
--- ext/ldap/ldap.c     2003-09-13 17:33:09.000000000 +0300
***************
*** 1210,1215 ****
--- 1210,1219 ----

        ldap_value = ldap_explode_dn(Z_STRVAL_PP(dn), Z_LVAL_PP(with_attrib));

+       if (ldap_value == NULL) {
+               RETURN_FALSE;
+       }
+
        i=0;
        while(ldap_value[i] != NULL) i++;
        count = i;


Reproduce code:
---------------
<?
$ret = ldap_explode_dn("6", 0);

if ($ret === false) {
    print "no good";
}
?>

Expected result:
----------------
text "no good" to be displayed

Actual result:
--------------
apache crashes with

[Sat Sep 13 17:12:37 2003] [notice] child pid 28620 exit signal Segmentation fault (11)

#0 0x405072ee in zif_ldap_explode_dn (ht=2, return_value=0x840fc2c, this_ptr=0x0, return_value_used=1) at /root/php-4.3.3/ext/ldap/ldap.c:1214 
#1 0x40655fae in execute (op_array=0x8393450) at /root/php-4.3.3/Zend/zend_execute.c:1616 
#2 0x406561e1 in execute (op_array=0x81e9bb8) at /root/php-4.3.3/Zend/zend_execute.c:1660 
#3 0x406561e1 in execute (op_array=0x83aaef4) at /root/php-4.3.3/Zend/zend_execute.c:1660 
#4 0x406581a8 in execute (op_array=0x8173bd4) at /root/php-4.3.3/Zend/zend_execute.c:2181 
#5 0x40644990 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /root/php-4.3.3/Zend/zend.c:885 
#6 0x4060ea77 in php_execute_script (primary_file=0xbfffecb0) at /root/php-4.3.3/main/main.c:1723 
#7 0x4065b0b0 in apache_php_module_main (r=0x8090f00, display_source_mode=0) at /root/php-4.3.3/sapi/apache/sapi_apache.c:54 
#8 0x4065c065 in send_php (r=0x8090f00, display_source_mode=0, filename=0x8092d90 "/home/www/arcoportal/phpbb2/profile.php") at /root/php-4.3.3/sapi/apache/mod_php4.c:620 
#9 0x4065c0de in send_parsed_php (r=0x8090f00) at /root/php-4.3.3/sapi/apache/mod_php4.c:635 
#10 0x08055137 in ap_invoke_handler (r=0x8090f00) at http_config.c:518 
#11 0x08069eff in process_request_internal (r=0x8090f00) at http_request.c:1308 
#12 0x0806a161 in ap_process_request (r=0x8090f00) at http_request.c:1324 
#13 0x08061bbf in child_main (child_num_arg=0) at http_main.c:4689 
#14 0x08061da3 in make_child (s=0x0, slot=2, now=0) at http_main.c:4868 
#15 0x08062166 in perform_idle_server_maintenance () at http_main.c:5050 
#16 0x0806286d in standalone_main (argc=5, argv=0xbffff1f4) at http_main.c:5287 
#17 0x08063076 in main (argc=5, argv=0xbffff1f4) at http_main.c:5566 
#18 0x401af8ae in __libc_start_main () from /lib/libc.so.6