From: tater at potatoe dot com
Operating system: OS X 10.2
PHP version: 5CVS-2003-11-16 (dev)
PHP Bug Type: Strings related
Bug description: switch on string offset crashes w/bus error
Description:
------------
a switch() statement testing a string offset, like
'switch($string{0})', crashes after executing the
matching case or default block. this only happens
if there is at least one case. workarounds: assign
offset to another variable first, or put it in
quotes like "{$string{0}}".
This breaks a lot of PEAR code, btw.
Reproduce code:
---------------
$x = 'abc';
switch ($x{0}) { default: print "default - works\n"; }
switch ($x{0}) { case 'a': print "case 'a' - bus error\n"; }
print "done\n";
Expected result:
----------------
default - works
case 'a' - bus error
done
Actual result:
--------------
default - works
case 'a' - bus error
Bus error
--------------------
backtrace:
(gdb) run bug.php
Starting program: /usr/local/book/php/bin/php bug.php
[Switching to process 5410 thread 0xb03]
Reading symbols for shared libraries . done
Reading symbols for shared libraries ............ done
default - works
case 'a' - bus error
Program received signal EXC_BAD_ACCESS, Could not access memory.
0x00229f8c in _zval_dtor (zvalue=0xbb4c10, __zend_filename=0x2c2a24
"/Users/tater/book/php-src/Zend/zend_execute.c", __zend_lineno=203) at
/Users/tater/book/php-src/Zend/zend_variables.c:44
44 CHECK_ZVAL_STRING_REL(zvalue);
(gdb)
--
Edit bug report at http://bugs.php.net/?id=26281&edit=1
--
Try a CVS snapshot (php4): http://bugs.php.net/fix.php?id=26281&r=trysnapshot4
Try a CVS snapshot (php5): http://bugs.php.net/fix.php?id=26281&r=trysnapshot5
Fixed in CVS: http://bugs.php.net/fix.php?id=26281&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=26281&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=26281&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=26281&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=26281&r=support
Expected behavior: http://bugs.php.net/fix.php?id=26281&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=26281&r=notenoughinfo
Submitted twice: http://bugs.php.net/fix.php?id=26281&r=submittedtwice
register_globals: http://bugs.php.net/fix.php?id=26281&r=globals
PHP 3 support discontinued: http://bugs.php.net/fix.php?id=26281&r=php3
Daylight Savings: http://bugs.php.net/fix.php?id=26281&r=dst
IIS Stability: http://bugs.php.net/fix.php?id=26281&r=isapi
Install GNU Sed: http://bugs.php.net/fix.php?id=26281&r=gnused
Floating point limitations: http://bugs.php.net/fix.php?id=26281&r=float
