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Bug #42237 [PATCH] stream_copy_to_stream returns invalid values for memmapped streams
Submitted: 2007-08-07 20:24 UTC Modified: 2007-08-08 02:16 UTC
From: andrew dot minerd at sellingsource dot com Assigned:
Status: Closed Package: Streams related
PHP Version: 5.2.4RC1 OS: Gentoo
Private report: No CVE-ID: None
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From: andrew dot minerd at sellingsource dot com
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 [2007-08-07 20:24 UTC] andrew dot minerd at sellingsource dot com 
Description:
------------
When copying from a memmapped stream, stream_copy_to_stream returns the length of the memory-mapped segment, regardless of how much data was actually written to the recipient stream.


Reproduce code:
---------------
<?php
class DummyWriteStream
{
	function stream_open($path, $mode, $options, &$opened_path) { return TRUE; }
	function stream_write($data) { return 0; }
}

stream_wrapper_register('test2', 'DummyWriteStream');

$fp1 = fopen('/etc/hosts', 'r');
$fp2 = fopen('test2://test', 'w');

var_dump(stream_copy_to_stream($fp1, $fp2, 8192));
?>

Expected result:
----------------
int(0)

Actual result:
--------------
int(1228)

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 [2007-08-07 20:26 UTC] andrew dot minerd at sellingsource dot com 
Patch:

--- streams.c   2007-01-15 09:07:07.000000000 -0800
+++ streams2.c  2007-08-07 13:23:14.000000000 -0700
@@ -1309,11 +1309,11 @@
                p = php_stream_mmap_range(src, php_stream_tell(src), maxlen, PHP_STREAM_MAP_MODE_SHARED_READONLY, &mapped);
 
                if (p) {
-                       haveread = php_stream_write(dest, p, mapped);
+                       written = php_stream_write(dest, p, mapped);
 
                        php_stream_mmap_unmap(src);
 
-                       return mapped;
+                       return written;
                }
        }
 [2007-08-07 20:37 UTC] andrew dot minerd at sellingsource dot com 
Erm, I changed haveread to written for clarity... obviously you'd have to define the variable, etc -- that was missing from my patch. :-p
 [2007-08-08 02:16 UTC] iliaa@php.net 
This bug has been fixed in CVS.

Snapshots of the sources are packaged every three hours; this change
will be in the next snapshot. You can grab the snapshot at
http://snaps.php.net/.
 
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