#23078 [Opn->Asn]: overload and switch

ID: 23078 Updated by: sniper@php.net Reported By: bugs dot php dot net at wizzard dot org -Status: Open +Status: Assigned Bug Type: Scripting Engine problem Operating System: FreeBSD 4.8-RC (recent) -PHP Version: 4.3.1 +PHP Version: 4.3.2-RC (latest CVS) -Assigned To: +Assigned To: andrei New Comment: Assigning to Andrei who wrote this thing, he can decide if it's worth to fix this. Previous Comments: ------------------------------------------------------------------------ [2003-04-07 01:01:05] bugs dot php dot net at wizzard dot org It seems that in a class with overloading enabled, inside a method, if you switch based on a declared attribute, PHP segfaults. Another FreeBSD user in #PHP on freenode was able to confirm the problem, using the following test code. I've worked out the test case using the CGI binary, but I've also confirmed that it happens through the APXS2 SAPI. In that case, the errors from apache are: [notice] child pid 72051 exit signal Segmentation fault (11) - and/or - httpd in free(): warning: chunk is already free The __get and __set methods are defined here as dummies just so overloading will truly be enabled. I'm assuming they would not be called because $var is pre-defined. Test Code: <?php class demo { var $var; function demo() { $this->var = FALSE; return TRUE; } function problem_function() { switch( $this->var ) { case 'foo': break; } return TRUE; } function __get($name, &$value) { return TRUE; } function __set($name, $value) { return TRUE; } } overload('demo'); $obj = new demo(); $obj->problem_function(); ?> Backtrace: (gdb) bt #0 overload_get_property (property_reference=0xbfbfdfe0) at /usr/ports/www/mod_php4/work/php-4.3.1/ext/overload/overload.c:363 #1 0x8144e07 in get_overloaded_property (T=0xbfbfdfd4) at /usr/ports/www/mod_php4/work/php-4.3.1/Zend/zend_execute.c:929 #2 0x814e2a3 in execute (op_array=0x8301ea4) at /usr/ports/www/mod_php4/work/php-4.3.1/Zend/zend_execute.c:92 #3 0x814adab in execute (op_array=0x8301424) at /usr/ports/www/mod_php4/work/php-4.3.1/Zend/zend_execute.c:1640 #4 0x81365f8 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/ports/www/mod_php4/work/php-4.3.1/Zend/zend.c:864 #5 0x810aaea in php_execute_script (primary_file=0xbfbffd0c) at /usr/ports/www/mod_php4/work/php-4.3.1/main/main.c:1573 #6 0x81532b6 in main (argc=3, argv=0xbfbffd70) at /usr/ports/www/mod_php4/work/php-4.3.1/sapi/cli/php_cli.c:746 #7 0x80637ca in _start () More: (gdb) f 0 #0 overload_get_property (property_reference=0xbfbfdfe0) at /usr/ports/www/mod_php4/work/php-4.3.1/ext/overload/overload.c:363 363 if (Z_TYPE_P(overloaded_property) == OE_IS_OBJECT) { (gdb) p overloaded_property $1 = (zend_overloaded_element *) 0x5a5a5a62 (gdb) p *overloaded_property Error accessing memory address 0x5a5a5a62: Bad address. PHP Config Args: './configure' '--with-apxs2=/usr/local/sbin/apxs' '--with-tsrm-pth' '--with-config-file-path=/usr/local/etc' '--enable-versioning' '--with-regex=system' '--without-gd' '--without-mysql' '--with-gd=/usr/local' '--enable-gd-native-ttf' '--with-freetype-dir=/usr/local' '--with-jpeg-dir=/usr/local' '--with-png-dir=/usr/local' '--with-zlib' '--with-bz2=/usr' '--with-mcrypt=/usr/local' '--with-mhash=/usr/local' '--with-imap=/usr/local' '--with-mysql=/usr/local' '--with-expat-dir=/usr/local' '--with-gettext=/usr/local' '--enable-debug' '--prefix=/usr/local' 'i386-portbld-freebsd4.8' ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=23078&edit=1