[Webkit-unassigned] [Bug 268314] New: Protect WebProcess::unblockServicesRequiredByAccessibility from attempting to consume nullptr sandbox extensions

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=268314

            Bug ID: 268314
           Summary: Protect
                    WebProcess::unblockServicesRequiredByAccessibility
                    from attempting to consume nullptr sandbox extensions
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: WebKit2
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org
                CC: kkinnunen at apple.com

The code in WebProcess::unblockServicesRequiredByAccessibility assumes that it will always work with non-nullptr Sandbox Extensions. However, it's possible for the SandboxExtension::create() method to return nullptr, so we should harden this code to avoid crashing under such conditions.

<rdar://121746329>

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