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Bug #75018 Data corruption when reading fields of bit type
Submitted: 2017-08-01 14:19 UTC Modified: 2017-10-23 05:28 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:1 (100.0%)
Same OS:1 (100.0%)
From: ale5000 at gmail dot com Assigned: ab (profile)
Status: Closed Package: MySQLi related
PHP Version: 7.1.7 OS: Windows 7 64-bit
Private report: No CVE-ID: None
View Developer Edit
 [2017-08-01 14:19 UTC] ale5000 at gmail dot com 
Description:
------------
It corrupt data when reading fields of bit type.
See the sample code.

The problem is possibly Windows specific but I'm not sure.

Test script:
---------------
<?php
$username = 'root';
$password = '';
$database_name = 'test_db';

$mysqli = new mysqli('127.0.0.1', $username, $password, $database_name);

if($mysqli->connect_errno) die('Error');

$sql = "CREATE TABLE test (bit_column_1 bit(1) NOT NULL) DEFAULT CHARSET=utf8";
$mysqli->query($sql);

$sql = "INSERT INTO test (bit_column_1) VALUES (0)";
$mysqli->query($sql);

$sql = "SELECT bit_column_1 FROM test";
if(!$result = $mysqli->query($sql)) die('Failed');

$row = $result->fetch_assoc();
echo "Result: ".$row['bit_column_1'];

Expected result:
----------------
0

Actual result:
--------------
668556962937438208

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 [2017-08-01 15:07 UTC] michal at cihar dot com 
I've just tested this and here is what I've found out:

- I can reproduce this when running 32-bit PHP on 64-bit Windows, it does not happen in 64-bit builds
- The returned value seems to be random, depending on executed code or MySQL statements
- I can reproduce this behavior on PHP 7.1.7 and 7.2.0beta1

Results I got: 0x1508618400000000 0x100000000 0x10c6632400000000 (though this most likely doesn't mean anything)
 [2017-09-13 11:06 UTC] ab@php.net 
Related To: Bug #75177
 [2017-09-13 12:13 UTC] ab@php.net 
Automatic comment on behalf of ab
Revision: http://git.php.net/?p=php-src.git;a=commit;h=3d93856c4a05394196c5610ae11cf019d1e18f76
Log: Fixed bug #75018, fixed bug #75177
 [2017-09-13 12:13 UTC] ab@php.net
-Status: Open +Status: Closed
 [2017-09-13 17:50 UTC] ale5000 at gmail dot com 
Thanks.

Since this bug can lead to data corruption is it possible to release a new version of PHP with this fix included in a short time?
 [2017-09-24 10:11 UTC] strange_v at ukr dot net 
I've just reproduced this issue on latest version (7.1.9) which was compiled from sources for armv7 platform.
 [2017-10-22 15:05 UTC] ab@php.net
-Assigned To: +Assigned To: ab
 [2017-10-22 15:05 UTC] ab@php.net 
Oh, i've overseen the question. It's included wit 7.1.11, see the NEWS.

Thanks.
 [2017-10-22 21:15 UTC] ale5000 at gmail dot com 
Hi,
I only see 7.1.10 on http://www.php.net/

Where is 7.1.11 and what is the url of the NEWS?
 [2017-10-23 05:28 UTC] ab@php.net 
@ale5000 coming this week. You can check the RC in the mean time http://windows.php.net/qa/ 

Thanks.
 
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