#41347 [NoF->Csd]: checkdnsrr() segfaults on empty hostname

From: Date: Wed, 23 May 2007 13:49:01 +0000
Subject: #41347 [NoF->Csd]: checkdnsrr() segfaults on empty hostname
References: 1  Groups: php.bugs 
Request: Send a blank email to php-bugs+get-112963@lists.php.net to get a copy of this message 
 ID:               41347
 Updated by:       spheroid@php.net
 Reported By:      spheroid@php.net
-Status:           No Feedback
+Status:           Closed
 Bug Type:         Network related
 Operating System: Mac OS X 10.4.9
 PHP Version:      5.2.2
 New Comment:

Works with 5.2.3-dev.


Previous Comments:
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[2007-05-18 01:00:01] php-bugs at lists dot php dot net

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

------------------------------------------------------------------------

[2007-05-10 13:17:50] scottmac@php.net

Please try using this CVS snapshot:

  http://snaps.php.net/php5.2-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5.2-win32-latest.zip



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[2007-05-10 12:18:49] scottmac@php.net

Can you try the patch at
http://server.macvicar.net/downloads/php/bug41347.patch.txt

Also does dns_get_mx segfault too?

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[2007-05-10 09:35:01] spheroid@php.net

Description:
------------
checkdnsrr() should return FALSE on error, but it segfaults if host 
argument is an empty string.

Reproduce code:
---------------
php -r 'var_dump(checkdnsrr("", "A"));'

Expected result:
----------------
bool(false)

Actual result:
--------------
zsh: bus error  php -r 'var_dump(checkdnsrr("", "A"));'

---

(gdb) run -r 'var_dump(checkdnsrr("", "A"));'
Starting program: /usr/local/bin/php -r 'var_dump(checkdnsrr("",
"A"));'
Reading symbols for shared libraries .+++..+++++..++++.. done

Program received signal EXC_BAD_ACCESS, Could not access memory.
Reason: KERN_PROTECTION_FAILURE at address: 0x00000000
0x901174ed in res_send ()



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