Bug #75649 [NEW]: fgets second parameter causes memory leak

From: Date: Thu, 07 Dec 2017 17:46:55 +0000
Subject: Bug #75649 [NEW]: fgets second parameter causes memory leak
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-213004@lists.php.net to get a copy of this message 
From:             zoolyka at gmail dot com
Operating system: ubuntu
PHP version:      5.6.32
Package:          *General Issues
Bug Type:         Bug
Bug description:fgets second parameter causes memory leak

Description:
------------
If I specify a larger number then 8192 for fgets's length then PHP
process starts to eat memory.

Test script:
---------------
<?php

$handle = fopen('multi_gb_file', 'r');
while (
  ! feof($handle)
) {
  $buffer = fgets($handle, 10485760);
}
fclose($handle);

?>

Expected result:
----------------
If length is much more then 8192 and the opened file is really huge then
memory usage will rise up to the size of the readed file's size.


-- 
Edit bug report at https://bugs.php.net/bug.php?id=75649&edit=1
-- 
Try a snapshot (PHP 5.4):   https://bugs.php.net/fix.php?id=75649&r=trysnapshot54
Try a snapshot (PHP 5.5):   https://bugs.php.net/fix.php?id=75649&r=trysnapshot55
Try a snapshot (trunk):     https://bugs.php.net/fix.php?id=75649&r=trysnapshottrunk
Fixed in SVN:               https://bugs.php.net/fix.php?id=75649&r=fixed
Fixed in release:           https://bugs.php.net/fix.php?id=75649&r=alreadyfixed
Need backtrace:             https://bugs.php.net/fix.php?id=75649&r=needtrace
Need Reproduce Script:      https://bugs.php.net/fix.php?id=75649&r=needscript
Try newer version:          https://bugs.php.net/fix.php?id=75649&r=oldversion
Not developer issue:        https://bugs.php.net/fix.php?id=75649&r=support
Expected behavior:          https://bugs.php.net/fix.php?id=75649&r=notwrong
Not enough info:            https://bugs.php.net/fix.php?id=75649&r=notenoughinfo
Submitted twice:            https://bugs.php.net/fix.php?id=75649&r=submittedtwice
register_globals:           https://bugs.php.net/fix.php?id=75649&r=globals
PHP 4 support discontinued: https://bugs.php.net/fix.php?id=75649&r=php4
Daylight Savings:           https://bugs.php.net/fix.php?id=75649&r=dst
IIS Stability:              https://bugs.php.net/fix.php?id=75649&r=isapi
Install GNU Sed:            https://bugs.php.net/fix.php?id=75649&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=75649&r=float
No Zend Extensions:         https://bugs.php.net/fix.php?id=75649&r=nozend
MySQL Configuration Error:  https://bugs.php.net/fix.php?id=75649&r=mysqlcfg

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