Bug #78989 [NEW]: Delayed variance check involving trait segfaults

From: Date: Wed, 18 Dec 2019 09:48:24 +0000
Subject: Bug #78989 [NEW]: Delayed variance check involving trait segfaults
Groups: php.bugs 
Request: Send a blank email to php-bugs+get-224380@lists.php.net to get a copy of this message 
From:             nikic
Operating system: 
PHP version:      7.4Git-2019-12-18 (Git)
Package:          Scripting Engine problem
Bug Type:         Bug
Bug description:Delayed variance check involving trait segfaults

Description:
------------
Delayed variance checks may crash when traits are involved. I believe
this is because we keep around a zend_function pointer to a
zend_function that only exists temporarily.

Test script:
---------------
<?php
class X {
    function method($a): T {}
}
trait T {
    function method($r): B {}
}
class U extends X {
    use T;
}



-- 
Edit bug report at https://bugs.php.net/bug.php?id=78989&edit=1
-- 
Fix committed:                    https://bugs.php.net/fix.php?id=78989&r=fixed
Fixed in release:                 https://bugs.php.net/fix.php?id=78989&r=alreadyfixed
Need backtrace:                   https://bugs.php.net/fix.php?id=78989&r=needtrace
Need Reproduce Script:            https://bugs.php.net/fix.php?id=78989&r=needscript
Try newer version:                https://bugs.php.net/fix.php?id=78989&r=oldversion
Not developer issue:              https://bugs.php.net/fix.php?id=78989&r=support
Expected behavior:                https://bugs.php.net/fix.php?id=78989&r=notwrong
Not enough info:                  https://bugs.php.net/fix.php?id=78989&r=notenoughinfo
Submitted twice:                  https://bugs.php.net/fix.php?id=78989&r=submittedtwice
register_globals:                 https://bugs.php.net/fix.php?id=78989&r=globals
PHP version support discontinued: https://bugs.php.net/fix.php?id=78989&r=phptooold
Daylight Savings:                 https://bugs.php.net/fix.php?id=78989&r=dst
IIS Stability:                    https://bugs.php.net/fix.php?id=78989&r=isapi
Install GNU Sed:                  https://bugs.php.net/fix.php?id=78989&r=gnused
Floating point limitations:       https://bugs.php.net/fix.php?id=78989&r=float
No Zend Extensions:               https://bugs.php.net/fix.php?id=78989&r=nozend
MySQL Configuration Error:        https://bugs.php.net/fix.php?id=78989&r=mysqlcfg

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