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Bug #78077 move_uploaded_file ignores stream_flush return value of reg. streamWrapper
Submitted: 2019-05-28 09:22 UTC Modified: 2021-07-27 15:48 UTC
Avg. Score:3.7 ± 1.9
Reproduced:2 of 3 (66.7%)
Same Version:0 (0.0%)
Same OS:1 (50.0%)
From: daniel dot pernold at gmail dot com Assigned:
Status: Open Package: Streams related
PHP Version: 7.2.18 OS: Ubuntu 18.04
Private report: No CVE-ID: None
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 [2019-05-28 09:22 UTC] daniel dot pernold at gmail dot com
PHP 7.2.17-0ubuntu0.18.04.1 (cli) (built: Apr 18 2019 14:12:38) ( NTS )

When using `move_uploaded_file` with a stream wrapper url as destination, the return value of the method `stream_flush` is ignored. The function `move_uploaded_file` always returns true, even if `stream_flush` returns false.

Test script:
class MyStreamWrapper

    public function stream_write($data)
        return 1;

    public function stream_flush()
        return false;


stream_wrapper_register('my-wrapper', \MyStreamWrapper::class, 0);
$res = move_uploaded_file($_FILES['uploaded_file']['tmp_name'], 'my-wrapper://' . basename($_FILES['uploaded_file']['name']));
echo $res ? 'true' : 'false';

Expected result:

Actual result:


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 [2021-07-27 15:48 UTC]
When implicitly flushing on close, the return value is not
checked[1]; that *might* be deliberate, given that almost none of
the implicit flushes checks the return value.

[1] <>
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