[Webkit-unassigned] [Bug 247332] New: Checking m_defaultPageGroup->preferences() in WebProcessPool::platformInitializeWebProcess() is probably wrong

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=247332

            Bug ID: 247332
           Summary: Checking m_defaultPageGroup->preferences() in
                    WebProcessPool::platformInitializeWebProcess() is
                    probably wrong
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Process Model
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

WebProcessPool::platformInitializeWebProcess() does:

    if (m_defaultPageGroup->preferences().useGPUProcessForDOMRenderingEnabled())
        parameters.maximumIOSurfaceSize = WebCore::IOSurface::maximumSize();

but m_defaultPageGroup->preferences() is uninitialized at this point, so this condition is never hit.

The same applies to checks for mediaDevicesEnabled and captureAudioInGPUProcessEnabled lower down.

Behavior might be different in different UI apps (depending on their use of the API). I reproduced the issue in MiniBrowser on macOS.

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