#26696 [Ctl]: Using string index in a switch() crashes

ID: 26696 Updated by: sniper@php.net Reported By: saruman at northernhacking dot org Status: Critical Bug Type: Zend Engine 2 problem Operating System: * PHP Version: 5CVS-2004-01-02 New Comment: See also #26801 Previous Comments: ------------------------------------------------------------------------ [2004-01-02 10:43:39] sniper@php.net Program received signal SIGSEGV, Segmentation fault. [Switching to Thread 16384 (LWP 20298)] 0x08357f99 in zend_pzval_unlock_func (z=0x1) at /usr/src/web/php/php5/Zend/zend_execute.c:64 64 z->refcount--; (gdb) bt #0 0x08357f99 in zend_pzval_unlock_func (z=0x1) at /usr/src/web/php/php5/Zend/zend_execute.c:64 #1 0x08358499 in zend_switch_free (opline=0x40e491f8, Ts=0xbfffd640) at /usr/src/web/php/php5/Zend/zend_execute.c:198 #2 0x083545d6 in zend_switch_free_handler (execute_data=0xbfffd7a0, op_array=0x40e48704) at /usr/src/web/php/php5/Zend/zend_execute.c:3072 #3 0x0834efd8 in execute (op_array=0x40e48704) at /usr/src/web/php/php5/Zend/zend_execute.c:1260 #4 0x0832d924 in zend_execute_scripts (type=8, retval=0x0, file_count=3) at /usr/src/web/php/php5/Zend/zend.c:1050 #5 0x082eac2c in php_execute_script (primary_file=0xbffffba0) at /usr/src/web/php/php5/main/main.c:1642 #6 0x08367237 in main (argc=2, argv=0xbffffc34) at /usr/src/web/php/php5/sapi/cli/php_cli.c:924 ------------------------------------------------------------------------ [2003-12-22 17:22:03] saruman at northernhacking dot org This bug is very similar to #26281, in fact, it's probably the same. ------------------------------------------------------------------------ [2003-12-22 17:00:20] moriyoshi@php.net Maybe related to bug #17997 ------------------------------------------------------------------------ [2003-12-22 14:51:55] saruman at northernhacking dot org case '?': is the culprit. ------------------------------------------------------------------------ [2003-12-22 14:33:53] saruman at northernhacking dot org Description: ------------ The ONLY change I'd done is install php-5.0.0b3 with the same config as the php-5.0.0b2 it replaced. Config vars: Configure Command './configure' '--with-pear' '--with-pgsql' '--with-apxs=/usr/local/apache/bin/apxs' '--enable-mbstring' '--prefix=/usr/local/php5' '--with-libxml-dir=/usr' Using this with php-5.0.0b2 works as expected. This behavior of a string is required by DB.php in PEAR, amongst others. Reproduce code: --------------- <?php //$str = Array('a', 's', 'd', 'd', '/', '?'); $str = 'asdd/?'; $len = strlen($str); for ($i = 0; $i < $len; $i++) { switch ($str[$i]) { case '?': echo '?'; break; } } ?> Did not crash. Expected result: ---------------- ?Did not crash. Actual result: -------------- From error_log: [Mon Dec 22 14:15:38 2003] [notice] child pid 30170 exit signal Segmentation fault (11) [Mon Dec 22 14:15:38 2003] [notice] child pid 30187 exit signal Segmentation fault (11) The two response are because MSIE seems to do a second query when the first one unexpectedly close. ------------------------------------------------------------------------ -- Edit this bug report at http://bugs.php.net/?id=26696&edit=1