pdo lazy object crash

[YuanchengJiang]

Description

The following code:

<?php
$cls = new finfo();
$db = new PDO('sqlite::memory:');
var_dump($y, @$y->queryString);
$x = $db->query('select 1 as queryString');
var_dump($x, $x->queryString);
$y = $x->fetch(PDO::FETCH_LAZY);
$fusion = $y;
foreach($fusion as $file_content_type){
echo "\n-- File having data of type ". $file_content_type ." --\n";
foreach($file_modes as $file_mode) {
create_files ( __DIR__, 1, $file_content_type, 0755, 512, "w", "fseek_ftell_rewind_variation"
,1,"bytes",".tmp");
}
}

Resulted in this output:

/home/phpfuzz/WorkSpace/flowfusion/php-src/Zend/zend_types.h:1382:9: runtime error: member access within misaligned address 0x742e316e6f697461 for type 'zend_refcounted' (aka 'struct _zend_refcounted'), which requires 4 byte alignment
0x742e316e6f697461: note: pointer points here
<memory cannot be printed>
SUMMARY: UndefinedBehaviorSanitizer: undefined-behavior /home/phpfuzz/WorkSpace/flowfusion/php-src/Zend/zend_types.h:1382:9 in 

To reproduce:

./php-src/sapi/cli/php  ./test.php

Commit:

cd586623b65c86b423883eda20411634e49084ba

Configurations:

CC="clang-12" CXX="clang++-12" CFLAGS="-DZEND_VERIFY_TYPE_INFERENCE" CXXFLAGS="-DZEND_VERIFY_TYPE_INFERENCE" ./configure --enable-debug --enable-address-sanitizer --enable-undefined-sanitizer --enable-re2c-cgoto --enable-fpm --enable-litespeed --enable-phpdbg-debug --enable-zts --enable-bcmath --enable-calendar --enable-dba --enable-dl-test --enable-exif --enable-ftp --enable-gd --enable-gd-jis-conv --enable-mbstring --enable-pcntl --enable-shmop --enable-soap --enable-sockets --enable-sysvmsg --enable-zend-test --with-zlib --with-bz2 --with-curl --with-enchant --with-gettext --with-gmp --with-mhash --with-ldap --with-libedit --with-readline --with-snmp --with-sodium --with-xsl --with-zip --with-mysqli --with-pdo-mysql --with-pdo-pgsql --with-pgsql --with-sqlite3 --with-pdo-sqlite --with-webp --with-jpeg --with-freetype --enable-sigchild --with-readline --with-pcre-jit --with-iconv

Operating System:

Ubuntu 20.04 Host, Docker 0599jiangyc/flowfusion:latest

This report is automatically generated by FlowFusion

PHP Version

cd58662

Operating System

No response

[nielsdos]

Reduced:

<?php
$db = new PDO('sqlite::memory:');
$x = $db->query('select 1 as queryString');
foreach ($x->fetch(PDO::FETCH_LAZY) as $entry) {
}

[nielsdos]

Fun fun, so it leaks on 8.3-8.4 and it crashes on master

[nielsdos]

Caused by 0537968, somehow...

[nielsdos]

The problem is that the queryString property is now no longer initialized...

[nielsdos]

Reopening as a reminder to also solve the leak problem on lower branches