From: [EMAIL PROTECTED]
Operating system: RedHat Linux 7.2
PHP version: 4.1.1
PHP Bug Type: LDAP related
Bug description: Resource destructor called too early
This bug is weird and it took me several days to track it down. But I have
found a way to reproduce it, so please read on.
This might also be a general problem, not only LDAP related.
I have reproduced it connecting to a NDS-LDAP-Gateway and an Active
Directory Server. Both only support LDAP v2, so it *might* not be
reproducable with a v3 server.
To verify it I suggest to activate implicit flushing in php.ini and
putting a php_printf() debug message into _free_ldap_result() in ldap.c,
just before ldap_msgfree() gets called. This way you will see that the
call to _free_ldap_result() will appear immediately after the PHP method
get_entry() returns.
After verification comment out the ldap_msgfree() call and you will
notice that the segfault no longer occurs.
Here is the code, the critical places have comments and debug messages
included:
class ldap {
function connect($server,$user="",$pw="") {
$this->link=ldap_connect($server);
$r=ldap_bind($this->link,$user,$pw);
}
function get_entry($dn) {
$res=ldap_read($this->link,$dn,"objectclass=*");
if (!$res) return false;
print "*** calling ldap_first_entry()<br>\n";flush();
$this->entry=ldap_first_entry($this->link, $res);
if (!$this->entry) return false;
print "*** returning from get_entry()<br>\n";
return true;
}
function get_attributes() {
if(!$this->entry) return false;
print "*** calling ldap_get_attributes(), prepare ".
"for segfault<br>\n";flush();
// Apache will segfault *here*, as the LDAPMessage
// was already freed!
$this->attributes=ldap_get_attributes($this->link,
$this->entry);
if(!$this->attributes) return false;
return true;
}
function print_entry($dn) {
if (!$this->get_entry($dn)) return false;
print "*** returned from get_entry()<br>\n";
// _free_ldap_result from ldap.c gets called
// although the resource is still referenced
// through $this->entry!!
if (!$this->get_attributes()) return false;
for($i=0;$i<$this->attributes['count'];$i++) {
$attrname=$this->attributes[$i];
$values=$this->attributes[$attrname];
for($j=0;$j<$values['count'];$j++) {
print "- $attrname [$j]: ".$values[$j]."<br>\n";
}
}
}
}
$ldap=new ldap();
$ldap->connect("ldapserver.example.com", "ldapuser",
"ldappassword");
$ldap->print_entry("CN=jonny,OU=User,DC=example,DC=com");
--
Edit bug report at http://bugs.php.net/?id=15431&edit=1
--
Fixed in CVS: http://bugs.php.net/fix.php?id=15431&r=fixedcvs
Fixed in release: http://bugs.php.net/fix.php?id=15431&r=alreadyfixed
Need backtrace: http://bugs.php.net/fix.php?id=15431&r=needtrace
Try newer version: http://bugs.php.net/fix.php?id=15431&r=oldversion
Not developer issue: http://bugs.php.net/fix.php?id=15431&r=support
Expected behavior: http://bugs.php.net/fix.php?id=15431&r=notwrong
Not enough info: http://bugs.php.net/fix.php?id=15431&r=notenoughinfo
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