[Webkit-unassigned] [Bug 157864] New: Code that need to null check the VM pointer before use should ref the VM.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157864

            Bug ID: 157864
           Summary: Code that need to null check the VM pointer before use
                    should ref the VM.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mark.lam at apple.com

Specifically, in JSLock::willReleaseLock() and HeapTimer::timerDidFire().  Otherwise, there's no guarantee that the VM won't be deleted after the null check.

Patch coming.

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