Bug #81659 [NEW]: stream_get_contents() loading entire file into memory
From: terence-marks at zencontrol dot com
Operating system: Debian Buster
PHP version: 8.0.13
Package: Streams related
Bug Type: Bug
Bug description:stream_get_contents() loading entire file into memory
Description:
------------
Passing length of -1 to stream_get_contents() with the file position
indicator of resource near the end of file still loads the entire file
into memory. Passing a fixed length to stream_get_contents() does not
produce the same behaviour.
Note: when running test script set memory_limit=64M
Test script:
---------------
<?php
$resource = fopen('/tmp/file1', 'a+');
for ($i = 0; $i < 64; ++$i)
{
$data = random_bytes(1024 * 1024);
$position = ftell($resource);
fwrite($resource, $data);
fseek($resource, $position);
stream_get_contents($resource, strlen($data));
}
$resource = fopen('/tmp/file2', 'a+');
for ($i = 0; $i < 64; ++$i)
{
$data = random_bytes(1024 * 1024);
$position = ftell($resource);
fwrite($resource, $data);
fseek($resource, $position);
stream_get_contents($resource, -1);
}
Actual result:
--------------
PHP Fatal error: Allowed memory size of 67108864 bytes exhausted (tried
to allocate 62922784 bytes) in script.php on line 22
--
Edit bug report at https://bugs.php.net/bug.php?id=81659&edit=1
--
Fix committed: https://bugs.php.net/fix.php?id=81659&r=fixed
Fixed in release: https://bugs.php.net/fix.php?id=81659&r=alreadyfixed
Need backtrace: https://bugs.php.net/fix.php?id=81659&r=needtrace
Need Reproduce Script: https://bugs.php.net/fix.php?id=81659&r=needscript
Try newer version: https://bugs.php.net/fix.php?id=81659&r=oldversion
Not developer issue: https://bugs.php.net/fix.php?id=81659&r=support
Expected behavior: https://bugs.php.net/fix.php?id=81659&r=notwrong
Not enough info: https://bugs.php.net/fix.php?id=81659&r=notenoughinfo
Submitted twice: https://bugs.php.net/fix.php?id=81659&r=submittedtwice
register_globals: https://bugs.php.net/fix.php?id=81659&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=81659&r=phptooold
Daylight Savings: https://bugs.php.net/fix.php?id=81659&r=dst
IIS Stability: https://bugs.php.net/fix.php?id=81659&r=isapi
Install GNU Sed: https://bugs.php.net/fix.php?id=81659&r=gnused
Floating point limitations: https://bugs.php.net/fix.php?id=81659&r=float
No Zend Extensions: https://bugs.php.net/fix.php?id=81659&r=nozend
MySQL Configuration Error: https://bugs.php.net/fix.php?id=81659&r=mysqlcfg
Thread (4 messages)
- terence-marks at zencontrol dot com