[Webkit-unassigned] [Bug 201572] New: [FTW] Minor cleanups to avoid crashes during web browsing

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201572

            Bug ID: 201572
           Summary: [FTW] Minor cleanups to avoid crashes during web
                    browsing
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bfulgham at webkit.org

This patch addresses two crashes seen when doing general web browsing on Amazon.com and Apple.com using the FTW build of WebKit:

1. ImageBuffer::sinkIntoImage was attempting to use a render target after WTFMoving it elsewhere.
2. ImageBuffer::copyNativeImage was not properly checking the type of the render target to make sure it was suitable for Bitmap operations.
3. BackingStoreBackendDirect2DImpl::scroll would crash if the scroll offset was outside the bounds of the current view. In that case, it would attempt to allocate a texture of zero size, which triggered a crash.

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