Bug #73370 [Com]: falsely exits with "Out of Memory" when using USE_ZEND_ALLOC=0

From: Date: Tue, 25 Oct 2016 19:51:21 +0000
Subject: Bug #73370 [Com]: falsely exits with "Out of Memory" when using USE_ZEND_ALLOC=0
References: 1  Groups: php.bugs 
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Edit report at https://bugs.php.net/bug.php?id=73370&edit=1

 ID:                 73370
 Comment by:         jim dot hofer at gmail dot com
 Reported by:        jim dot hofer at gmail dot com
 Summary:            falsely exits with "Out of Memory" when using
                     USE_ZEND_ALLOC=0
 Status:             Feedback
 Type:               Bug
 Package:            MySQLi related
 Operating System:   Irrelevant
 PHP Version:        Irrelevant
 Assigned To:        laruence
 Block user comment: N
 Private report:     N

 New Comment:

The source in the srpm i'm applying it to is

md5sum php-7.0.12.tar.xz
bdcc4dbdac90c2a39422786653059f70  php-7.0.12.tar.xz

which is the same checksum as the source on the downloads page.

what version is this patch supposed to be applied to?


Previous Comments:
------------------------------------------------------------------------
[2016-10-25 19:42:42] yohgaki@php.net

You should use plain source as we aren't responsible for packaging bug.

------------------------------------------------------------------------
[2016-10-25 16:02:58] jim dot hofer at gmail dot com

I've tried to apply the patch but it's being rejected.

I'm using php-7.0.12-2.remi.src.rpm to apply the patch and build the rpm

------------------------------------------------------------------------
[2016-10-22 07:07:52] laruence@php.net

please try follow patch:

diff --git a/Zend/zend_alloc.c b/Zend/zend_alloc.c
index 40eb100..5c9f124 100644
--- a/Zend/zend_alloc.c
+++ b/Zend/zend_alloc.c
@@ -2850,7 +2850,9 @@ static ZEND_COLD ZEND_NORETURN void zend_out_of_memory(void)

 ZEND_API void * __zend_malloc(size_t len)
 {
-   void *tmp = malloc(len);
+ void *tmp;
+ len = MAX(len, 1);
+ tmp = malloc(len);
        if (EXPECTED(tmp)) {
                return tmp;
        }

thanks

------------------------------------------------------------------------
[2016-10-21 18:29:59] jim dot hofer at gmail dot com

Description:
------------
I'm using USE_ZEND_ALLOC=0 for some cli scripts due this bug https://bugs.php.net/bug.php?id=72736

When using USE_ZEND_ALLOC=0 and querying mysql with buffered queries on and the select query returns
an empty result set the script exits with the message "Out of Memory"

Setting the query to use unbuffered results in expected behavior.

Also, not setting USE_ZEND_ALLOC=0 and querying unbuffered returns results in expected behavior

This bug does not affect 7.0.11

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

$mysqli = new mysqli("localhost", "root");
$result = $mysqli->query("SELECT * FROM mysql.user WHERE User = 'test'",
MYSQLI_USE_RESULT)->fetch_all();
var_dump($result);

$result = $mysqli->query("SELECT * FROM mysql.user WHERE User =
'test'")->fetch_all();
var_dump($result);

Expected result:
----------------
array(0) {
}
array(0) {
}

Actual result:
--------------
array(0) {
}
Out of memory


------------------------------------------------------------------------



--
Edit this bug report at https://bugs.php.net/bug.php?id=73370&edit=1


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