Bug #78761 [NEW]: Zend memory heap corruption with preload and pointer casting

From: lisachenko dot it at gmail dot com Operating system: Windows x64 PHP version: 7.4.0RC4 Package: *Extensibility Functions Bug Type: Bug Bug description:Zend memory heap corruption with preload and pointer casting Description: ------------ There is a zend_mm_heap corruption when using FFI preload mode and proxying requests to the FFI::cast from a preloaded class. Corruptions appear when trying to cast any CData pointer to another type via preloaded class that wraps FFI::cast() internally. Test script: --------------- See gist: https://gist.github.com/lisachenko/f133184201aa3c63d58af9548bdd825a Expected result: ---------------- No memory corruption Actual result: -------------- Script terminated with zend_mm_heap corrupted -- Edit bug report at https://bugs.php.net/bug.php?id=78761&edit=1 -- Fix committed: https://bugs.php.net/fix.php?id=78761&r=fixed Fixed in release: https://bugs.php.net/fix.php?id=78761&r=alreadyfixed Need backtrace: https://bugs.php.net/fix.php?id=78761&r=needtrace Need Reproduce Script: https://bugs.php.net/fix.php?id=78761&r=needscript Try newer version: https://bugs.php.net/fix.php?id=78761&r=oldversion Not developer issue: https://bugs.php.net/fix.php?id=78761&r=support Expected behavior: https://bugs.php.net/fix.php?id=78761&r=notwrong Not enough info: https://bugs.php.net/fix.php?id=78761&r=notenoughinfo Submitted twice: https://bugs.php.net/fix.php?id=78761&r=submittedtwice register_globals: https://bugs.php.net/fix.php?id=78761&r=globals PHP version support discontinued: https://bugs.php.net/fix.php?id=78761&r=phptooold Daylight Savings: https://bugs.php.net/fix.php?id=78761&r=dst IIS Stability: https://bugs.php.net/fix.php?id=78761&r=isapi Install GNU Sed: https://bugs.php.net/fix.php?id=78761&r=gnused Floating point limitations: https://bugs.php.net/fix.php?id=78761&r=float No Zend Extensions: https://bugs.php.net/fix.php?id=78761&r=nozend MySQL Configuration Error: https://bugs.php.net/fix.php?id=78761&r=mysqlcfg