[Webkit-unassigned] [Bug 170912] New: [iOS, macOS] Guard against passing nullptr to vImagePremultiplyData

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=170912

            Bug ID: 170912
           Summary: [iOS, macOS] Guard against passing nullptr to
                    vImagePremultiplyData
           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

If the system is under heavy memory pressure, it is possible for a calloc to fail, resulting in an ImageBuffer with a nullptr data member.

We should return from an attempt to perform ImageBuffer::putData on a nullptr without taking any action, or perhaps RELEASE_ASSERT that we encountered this case.

Since the memory pressure may be transient, it seems reasonable to just bail out early; a future attempt may succeed.

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