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Bug #30798 debug_backtrace returns invalid data in some cases
Submitted: 2004-11-15 18:31 UTC Modified: 2005-01-28 10:52 UTC
From: mikko dot rantalainen at peda dot net Assigned:
Status: Closed Package: Reproducible crash
PHP Version: 4.3.9 OS: Mandrake Linux 10.0
Private report: No CVE-ID: None
 [2004-11-15 18:31 UTC] mikko dot rantalainen at peda dot net
Attached script crashes PHP 4.3.4 (plus security fixes) which is latest versions distributed with Mandrake Linux.

Reproduce code:
<?php function __errorHandler($errno, $errstr, $errfile, $errline, $errcontext)
	error_log("__errorHandler: $errno: $errstr");
	$trace = debug_backtrace();
	foreach ($trace as $data)
		$function = isset($data["function"]) ? $data["function"] : "???";
		if ($function == "__errorhandler")
			continue; # don't print error handler
		$file = isset($data["file"]) ? $data["file"] : "???";
		$line = isset($data["line"]) ? $data["line"] : "??";
		$args = isset($data["args"]) ? serialize($data["args"]) : ""; # XXX
		error_log("$file:$line: $function($args)\n");
print("<h1>Check log.</h1>");
$parts = split("/",array()); # generate error here

Expected result:
A warning message have been sent to server log and a full page should have been returned to a client.

Actual result:
PHP crashes at line marked with "XXX". The problem seems to be related to the fact that the error is generated with incorrect call to split().


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 [2004-11-15 18:40 UTC]
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 [2005-01-28 10:52 UTC] mikko dot rantalainen at peda dot net
I just checked this problem again. The reproduce code segfaults 4.3.9 but works with 4.3.10. Marking as closed.
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