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Bug #41833 addChild() on a non-existent node, no node created, getName() segfaults
Submitted: 2007-06-28 02:18 UTC Modified: 2007-07-31 15:42 UTC
From: hubert dot roksor at gmail dot com Assigned: rrichards (profile)
Status: Closed Package: SimpleXML related
PHP Version: 5CVS-2007-06-28 (snap) OS:
Private report: No CVE-ID: None
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From: hubert dot roksor at gmail dot com
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 [2007-06-28 02:18 UTC] hubert dot roksor at gmail dot com
addChild() does not behave as expected(?) when used on a node that wasn't previously declared.

In the example below, we initialize an empty tree, to which we attempt to add a new node at "/child/grandchild" without previously adding "child" to the tree. addChild() seems to operate on a temporary SimpleXMLElement and the changes are never applied to the original object/tree.

I believe that this bug is also responsible of the segfault that happens if getName() is used on the temporary SimpleXMLElement. I was very tempted to file this bug as a reproducible crash, but decided to file it under SimpleXML in case it would help routing it to the maintainer faster.

Tested on:

PHP 5.2.4-dev (cli) (built: Jun 27 2007 20:04:30)
libxml2 2.6.26
SimpleXML Revision:

PHP 5.2.2-pl1-gentoo (cli) (built: May 24 2007 00:26:35)
libxml 2.6.27
SimpleXML Revision:

Reproduce code:

$xml = simplexml_load_string('<?xml version="1.0" encoding="utf-8" ?><root />');

echo $xml->asXML();

Expected result:
I expect SimpleXML to create "child" if it does not exist, then add "grandchild" to that node. The output should be:

<?xml version="1.0" encoding="utf-8"?>

Actual result:
Neither node is added to the tree. The output is:

<?xml version="1.0" encoding="utf-8"?>


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 [2007-07-30 01:22 UTC] mail_ben_schmidt at yahoo dot com dot au
I believe related to this bug: on my machine (Mac OS X 10.4.9 Intel; PHP 5.2.3/5.2-200707181030) I get a bus error if I do it with a namespace, i.e.


Exception:  EXC_BAD_ACCESS (0x0001)
Codes:      KERN_PROTECTION_FAILURE (0x0002) at 0x00000020

Thread 0 Crashed:
0   php 	0x0018596f zim_simplexml_element_addChild + 263 (simplexml.c:1512)

 [2007-07-31 15:42 UTC]
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
Thank you for the report, and for helping us make PHP better.

Segfaults are fixed. addChild() cannot be called on a temporary node, so output is correct and warning is now issued.
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