[Webkit-unassigned] [Bug 258313] New: WebPageProxy::setToolTip accesses a null PageClient

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258313

            Bug ID: 258313
           Summary: WebPageProxy::setToolTip accesses a null PageClient
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: UI Events
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: a_protyasha at apple.com
                CC: webkit-bug-importer at group.apple.com

In 264455 at main, we introduced `WebPageProxy::dispatchMouseDidMoveOverElementAsynchronously`, which asks to perform `WebPageProxy::mouseDidMoveOverElement` at a future time. It turns out there's a null access on `m_pageClient` when we then call into `WebPageProxy::setToolTip`, which happens because we hold a `WeakPtr<PageClient>` instance to the `PageClient` object, meaning there are no guarantees on the PageClient instance's lifetime.

We should make sure this null deference does not happen.

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