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Bug #21961 get_parent_class segfault
Submitted: 2003-01-30 08:03 UTC Modified: 2003-02-10 08:00 UTC
From: msopacua@php.net Assigned:
Status: Closed Package: Scripting Engine problem
PHP Version: 5CVS-2003-01-30 (dev) OS: FreeBSD 4.7
Private report: No CVE-ID: None
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 [2003-01-30 08:03 UTC] msopacua@php.net 
Additionals:
Apache 1.3.27-mod_ssl

Script to reproduce:
<?php

class man
{
        var $name, $bars;
        function man()
        {
                $this->name = 'Mr. X';
                $this->bars = array();
        }

        function getdrunk($where)
        {
                $this->bars[] = new bar($where);
        }

        function getName()
        {
                return $this->name;
        }
}

class bar extends man
{
        var $name;

        function bar($w)
        {
                $this->name = $w;
        }

        function getName()
        {
                return $this->name;
        }

        function whosdrunk()
        {
                $who = get_parent_class($this);
                if($who == NULL)
                {
                        return 'nobody';
                }
                return eval($who.'::getName()');
        }
}

$x = new man;
$x->getdrunk('The old Tavern');
$x->bars[0]->whosdrunk();
?>

Backtrace:
Program received signal SIGSEGV, Segmentation fault.
0x28586642 in zif_get_parent_class (ht=1, return_value=0x8104858, this_ptr=0x0, return_value_used=1)
    at /home/mdev/cvs/php5/Zend/zend_builtin_functions.c:563
563                             name = ce->name;
#0  0x28586642 in zif_get_parent_class (ht=1, return_value=0x8104858, this_ptr=0x0, return_value_used=1)
    at /home/mdev/cvs/php5/Zend/zend_builtin_functions.c:563
#1  0x28594f5b in zend_do_fcall_common_helper (execute_data=0xbfbfe0bc, op_array=0x8106850)
    at /home/mdev/cvs/php5/Zend/zend_execute.c:2620
#2  0x285956a5 in zend_do_fcall_handler (execute_data=0xbfbfe0bc, op_array=0x8106850)
    at /home/mdev/cvs/php5/Zend/zend_execute.c:2748
#3  0x2858f5c7 in execute (op_array=0x8106850) at /home/mdev/cvs/php5/Zend/zend_execute.c:1227
#4  0x28595158 in zend_do_fcall_common_helper (execute_data=0xbfbfe39c, op_array=0x810388c)
    at /home/mdev/cvs/php5/Zend/zend_execute.c:2654
#5  0x28595577 in zend_do_fcall_by_name_handler (execute_data=0xbfbfe39c, op_array=0x810388c)
    at /home/mdev/cvs/php5/Zend/zend_execute.c:2718
#6  0x2858f5c7 in execute (op_array=0x810388c) at /home/mdev/cvs/php5/Zend/zend_execute.c:1227
#7  0x2857b7b0 in zend_execute_scripts (type=8, retval=0x0, file_count=3)
    at /home/mdev/cvs/php5/Zend/zend.c:996
#8  0x2853d0dc in php_execute_script (primary_file=0xbfbff944) at /home/mdev/cvs/php5/main/main.c:1699
#9  0x2859be4a in apache_php_module_main (r=0x809f038, display_source_mode=0)
    at /home/mdev/cvs/php5/sapi/apache/sapi_apache.c:55
#10 0x2859ce90 in send_php (r=0x809f038, display_source_mode=0, 
    filename=0x80a0b08 "/usr/local/www/data/bug.php") at /home/mdev/cvs/php5/sapi/apache/mod_php4.c:608
#11 0x2859cf03 in send_parsed_php (r=0x809f038) at /home/mdev/cvs/php5/sapi/apache/mod_php4.c:623
#12 0x8053688 in ap_invoke_handler (r=0x809f038) at http_config.c:518
#13 0x80631a9 in process_request_internal (r=0x809f038) at http_request.c:1308
#14 0x8063208 in ap_process_request (r=0x809f038) at http_request.c:1324
#15 0x805c63e in child_main (child_num_arg=0) at http_main.c:4689
#16 0x805c7d0 in make_child (s=0x8099038, slot=0, now=1043934649) at http_main.c:4813
#17 0x805c8ed in startup_children (number_to_start=5) at http_main.c:4895
#18 0x805cddc in standalone_main (argc=3, argv=0xbfbffc4c) at http_main.c:5203
#19 0x805d4d7 in main (argc=3, argv=0xbfbffc4c) at http_main.c:5566
(gdb) print ce
$1 = (zend_class_entry *) 0x0

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 [2003-02-03 07:39 UTC] moriyoshi@php.net 
Verified.

BTW how come "bar" extends "man"?
 [2003-02-03 10:27 UTC] k.schroeder@php.net 
tests/lang/bug21961.phpt failed on W2k server for latest PHP4-Win32-Stable snap. Reason: no SKIPIF for version < 5.0.0

---- EXPECTED OUTPUT
string(14) "The old Tavern"
---- ACTUAL OUTPUT
Parse error: parse error, unexpected $end in D:\work\php4\tests\lang\bug21961.php(44) : eval()'d code on line 1
bool(false)
---- FAILED
 [2003-02-10 04:04 UTC] zeev@php.net 
Fixed.

The attached code was broken, by the way.  Attached is a fixed version of the code.

<?php

class man
{
        private $name;
        public $bars;

        function man()
        {
                $this->name = 'Mr. X';
                $this->bars = array();
        }

        function getdrunk($where)
        {
                $this->bars[] = new bar($where);
        }

        function getName()
        {
                return $this->name;
        }
}

class bar extends man
{
        var $name;

        function bar($w)
        {
                $this->name = $w;
        }


        function getName()
        {
                return $this->name;
        }

        function whosdrunk()
        {
                $who = get_parent_class($this);
                if($who == NULL)
                {
                        return 'nobody';
                }
                print "$who\n";
                eval('print '.$who.'::getName();');
        }
}

$x = new man;
$x->getdrunk('The old Tavern');
$x->bars[0]->whosdrunk();
?>
 
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