[Webkit-unassigned] [Bug 155234] New: Harden JSC Root element functions from bad values

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=155234

            Bug ID: 155234
           Summary: Harden JSC Root element functions from bad values
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: msaboff at apple.com

The Root related functionCreateElement(), functionGetElement() and functionSetElementRoot() currently do not protect against bad values.

In some cases, fuzzer code will cause crashes in this code.

Their jsCast() calls should be replaced with jsDynamicCast() and appropriate checks.

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