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Bug #14226 multiple ob_end_clean() problem
Submitted: 2001-11-26 06:06 UTC Modified: 2002-02-28 21:36 UTC
From: yasuo_ohgaki at yahoo dot com Assigned: yohgaki (profile)
Status: Closed Package: Output Control
PHP Version: 4.1.0/4.2.0 OS: ANY
Private report: No CVE-ID: None
View Developer Edit
 [2001-11-26 06:06 UTC] yasuo_ohgaki at yahoo dot com 
4.1.0RC and 4.2.0-dev doesn't output last echo statement. 
Nesting level handling problem?

<?php
ob_start();
echo "AAAAAAAAAAAAAAAAAAAAAAA";

ob_end_clean();
ob_end_clean();
ob_end_clean();
ob_end_clean();
ob_end_clean();
ob_end_clean();
ob_end_clean();
ob_end_clean();
ob_end_clean();

echo "BBBBBBBBBBBBBBBBBBBBBBB";

?>

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 [2001-11-26 06:16 UTC] yasuo_ohgaki at yahoo dot com 
I cannot reproduce segfualt, but it seems PHP may segfault with this. Here is apache error log.

[Mon Nov 26 19:45:19 2001]  Script:  '/home/yohgaki/public_html/bugs/output/bug.php'
---------------------------------------
output.c(245) : Block 0x0818A668 status:
Beginning:      Overrun (magic=0x401D1178, expected=0x7312F8DC)
      End:      Unknown
---------------------------------------
[Mon Nov 26 19:45:19 2001]  Script:  '/home/yohgaki/public_html/bugs/output/bug.php'
---------------------------------------
output.c(245) : Block 0x0818A668 status:
Beginning:      Overrun (magic=0x401D1178, expected=0x7312F8DC)
      End:      Unknown
---------------------------------------
[Mon Nov 26 19:45:19 2001]  Script:  '/home/yohgaki/public_html/bugs/output/bug.php'
---------------------------------------
output.c(245) : Block 0x0818A668 status:
Beginning:      Overrun (magic=0x401D1178, expected=0x7312F8DC)
      End:      Unknown
---------------------------------------
[Mon Nov 26 19:45:19 2001] [notice] child pid 6681 exit signal Segmentation fault (11)
 [2001-12-02 08:20 UTC] yasuo_ohgaki at yahoo dot com 
A little update.
ob_end_flush() has problem also.
 [2001-12-02 17:19 UTC] yasuo_ohgaki at yahoo dot com 
Ok I think I found what's wrong in PHP.
If zlib.output_compression is enabled and the zlib output compression handler is deleted from php_ob_buffer,  output will not be sent.

I'll leave the real fix for people who knows about zlib output compression and output buffering.

I just need to know nesting level to make my script work as I want. I'll send patch  for the new function later.
 [2001-12-12 04:18 UTC] yohgaki@php.net 
Assigned to myself.
 [2002-02-07 02:41 UTC] yohgaki@php.net 
To fix this bug, buffer state managment for each outout buffer is requried.
 - Is started?
 - Is deletable after buffering is started?
for internal buffers. (zlib.compression namely)

I can add new parameter, deletable or not, to ob_start() for user defined handlers also. Anyone need this?
 [2002-02-28 21:36 UTC] yohgaki@php.net 
Patch will be commited shortly. 

However, a issue is left. Flush feature need to be reimplemented to work.
 
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