[Webkit-unassigned] [Bug 232512] Fix a null ptr deref by checking that newOffset is a valid key before adding to the HashMap.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=232512

--- Comment #2 from John Cunningham <johncunningham at apple.com> ---
Created attachment 442873

  --> https://bugs.webkit.org/attachment.cgi?id=442873&action=review

Patch

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