[Webkit-unassigned] [Bug 132489] New: [Mac] -[_WKThumbnailView _requestSnapshotIfNeeded] assumes that taking a snapshot will always succeed

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=132489

           Summary: [Mac] -[_WKThumbnailView _requestSnapshotIfNeeded]
                    assumes that taking a snapshot will always succeed
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: NEW
          Keywords: InRadar
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: mrowe at apple.com


The takeSnapshot callback in -[_WKThumbnailView _requestSnapshotIfNeeded] assumes that taking the snapshot will always succeed. If it fails and the callback receives a null ShareableBitmap::Handle, as can happen if the WKView is closed while a snapshot request is pending, the callback will dereference null.

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