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Subject: segfault with iterators
From: rrichards@ctindustries.net ("Rob Richards")

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I ran into this with simplexml but am able to reproduce with userland =
classes.

The segfault only occurs when the property in question does not exist, =
no __get and __set methods implemented (if either is implemented then no =
segfault), and is not being called off the initial object in the =
foreach.
i.e. - $obj->valid()->invalid will segfault while $obj->invalid doesnt.

class Test implements Iterator {

   function c() {
      return new Test();
   }

/* No need to implement functionality - never gets here */
   public function rewind() {}
   public function key() {}
   public function current() {}
   public function next() {}
   public function hasMore() {}
}

$obj =3D new Test();

/*
foreach ($obj->c() as $value) { - works correctly with functions =
implemented
foreach ($obj->a as $value) { -  correctly issues Invalid argument =
supplied for foreach()
*/
foreach ($obj->c()->a as $value) { // Segafults
    print "Test\n";
}

0x08298238 in zend_pzval_unlock_func (z=3D0x5a5a5a5a)
    at /home/rrichards/php5/Zend/zend_execute.c:65
65              z->refcount--;
(gdb) bt
#0  0x08298238 in zend_pzval_unlock_func (z=3D0x5a5a5a5a)
    at /home/rrichards/php5/Zend/zend_execute.c:65
#1  0x082984dd in _get_zval_ptr_ptr (node=3D0x4047ea2c, Ts=3D0xbfffb860)
    at /home/rrichards/php5/Zend/zend_execute.c:142
#2  0x08295c59 in zend_fe_reset_handler (execute_data=3D0xbfffba90,=20
    opline=3D0x4047ea14, op_array=3D0x4047e3c0)
    at /home/rrichards/php5/Zend/zend_execute.c:3630
#3  0x0828f7f4 in execute (op_array=3D0x4047e3c0)
    at /home/rrichards/php5/Zend/zend_execute.c:1339
#4  0x0826d4d1 in zend_execute_scripts (type=3D8, retval=3D0x0, =
file_count=3D3)
    at /home/rrichards/php5/Zend/zend.c:1052
#5  0x0822a364 in php_execute_script (primary_file=3D0xbfffde90)
    at /home/rrichards/php5/main/main.c:1647
#6  0x0829c7ee in main (argc=3D2, argv=3D0xbfffdf24)
    at /home/rrichards/php5/sapi/cli/php_cli.c:941
#7  0x42015704 in __libc_start_main () from /lib/tls/libc.so.6

Rob


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