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Bug #14807 base_convert() crashes with > 1500 digits
Submitted: 2002-01-02 13:39 UTC Modified: 2002-06-17 20:04 UTC
From: amnuts at talker dot com Assigned:
Status: Closed Package: Reproducible crash
PHP Version: 4.3.0-dev OS: Linux
Private report: No CVE-ID: None
View Developer Edit
 [2002-01-02 13:39 UTC] amnuts at talker dot com 
Running the following always causes a core dump:

<?php

$arr = array (
        1 => array ("0","0","0","0","0"),
        2 => array ("0","0","0","0","0"),
        3 => array ("0","0","0","0","0"),
        4 => array ("0","0","0","0","0"),
        5 => array ("0","0","0","0","0")
        );

print_r($arr);
echo "<br>\n\n<br>\n\n";
$str = serialize($arr);
echo "serialized<br>\n", $str, "<br><br>\n\n";

function hex2bin($data) {
    $len = strlen($data);
    return pack("H" . $len, $data);
}

$enc = urlencode($str);
echo "urlencoded<br>", $enc, "<br><br>\n\n";
$gzd = gzcompress($enc);
//echo "gzcompressed (urlencoded)<br>", $gzd, "<br><br>\n\n";
$b64 = base64_encode($gzd);
echo "base64_encoded<br>", $b64, "<br><br>\n\n";
$b2h = bin2hex($enc);
echo "bin2hex (urlencoded)<br>", $b2h, "<br><br>\n\n";
$binary = base_convert($b2h, 16, 2);
echo $binary, "<br><br>\n\n";
$conv = base_convert($binary, 2, 16);
echo $conv, "<br><br>\n\n";
$h2b = hex2bin($conv);
echo $h2b, "<br><br>\n\n";
$md = md5($str);
echo "md5<br>", $md, "<br><br>\n";

?>

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 [2002-01-02 13:46 UTC] jan@php.net 
at least for me it doesn't (FreeBSD 4.4 PHP 4.1.0)
can you provide more Information about you environmation (OS, configure options e.g.) ?
 [2002-01-02 14:11 UTC] amnuts at talker dot com 
I am using it in CGI mode, and this is some info that might be useful to you:

bash$ cat /proc/version
Linux version 2.2.20 (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #1 SMP Fri Nov 9 09:25:22 EST 2001

phpinfo()

PHP Version 4.1.0
System Linux <host name removed> 2.2.20 #1 SMP Fri Nov 9 09:25:22 EST 2001 i686 unknown
Build DateDec 24 2001
Configure Command './configure' '--with-apxs=/usr/local/apache/bin/apxs' '--with-xml' '--with-curl' '--with-swf=/usr/local/flash' '--enable-ftp' '--with-gd=../gd-1.8.4' '--with-jpeg-dir=/usr/local' '--with-xpm-dir=/usr/X11R6' '--with-png-dir=/usr' '--with-imap=../imap-2001.BETA.SNAP-0105220031' '--with-ming=../ming-0.1.1' '--enable-magic-quotes' '--with-mysql' '--enable-safe-mode' '--enable-track-vars' '--with-ttf' '--enable-versioning' '--with-zlib'
Server API CGI
Virtual Directory Support disabled
Configuration File (php.ini) Path /usr/local/Zend/etc/php.ini
ZEND_DEBUG disabled
Thread Safety disabled


If you need anything else, just let me know.
 [2002-01-03 03:43 UTC] thies@php.net 
your testcase can be reduced to:
<?php
$data = 
"612533413525334125374269253341312533426125334135253341253742692533413025334273253341312533412532323025323225334269253341312533427325334131253341253232302532322533426925334132253342732533413125334125323230253232253342692533413325334273253341312533412532323025323225334269253341342533427325334131253341253232302532322533422537446925334132253342612533413525334125374269253341302533427325334131253341253232302532322533426925334131253342732533413125334125323230253232253342692533413225334273253341312533412532323025323225334269253341332533427325334131253341253232302532322533426925334134253342732533413125334125323230253232253342253744692533413325334261253341352533412537426925334130253342732533413125334125323230253232253342692533413125334273253341312533412532323025323225334269253341322533427325334131253341253232302532322533426925334133253342732533413125334125323230253232253342692533413425334273253341312533412532323025323225334225374469253341342533426125334135253341253742692533413025334273253341312533412532323025323225334269253341312533427325334131253341253232302532322533426925334132253342732533413125334125323230253232253342692533413325334273253341312533412532323025323225334269253341342533427325334131253341253232302532322533422537446925334135253342612533413525334125374269253341302533427325334131253341253232302532322533426925334131253342732533413125334125323230253232253342692533413225334273253341312533412532323025323225334269253341332533427325334131253341253232302532322533426925334134253342732533413125334125323230253232253342253744253744";
$binary = base_convert($data, 16, 2);
?>

you are trying to base_convert a number with > 1500 digits. this is not going to work! but it shouln't crash, 
i agree. (no time to fix it right now)
 [2002-03-30 13:44 UTC] mss at medecom dot com 
Another test case which makes base_convert dump core is this:

<?php
$x=base_convert ("2f0f336509c9a3d0f29e4281321d496f", 16, 36);
echo $x;
echo Done;
?>

I have not experienced this problem under SuSE 7.2 but under the following:


Mandrake 8.2
Linux p700 2.4.18-6mdk #1 Fri Mar 15 02:59:08 CET 2002 i686 unknown

apache-1.3.23-4mdk
apache-common-1.3.23-4mdk
apache-modules-1.3.23-4mdk
mod_php-4.1.2-1mdk
php-4.1.2-1mdk
php-common-4.1.2-1mdk
 [2002-06-17 19:13 UTC] sniper@php.net 
Reproduced with latest CVS HEAD.
 [2002-06-17 20:04 UTC] edink@php.net 
This bug has been fixed in CVS. You can grab a snapshot of the
CVS version at http://snaps.php.net/. In case this was a documentation 
problem, the fix will show up soon at http://www.php.net/manual/.
In case this was a PHP.net website problem, the change will show
up on the PHP.net site and on the mirror sites.
Thank you for the report, and for helping us make PHP better.
 
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