[Webkit-unassigned] [Bug 252603] New: [WebGPU] GPUBuffer::getMappedRange will attempt to copy from nullptr if mapping fails

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=252603

            Bug ID: 252603
           Summary: [WebGPU] GPUBuffer::getMappedRange will attempt to
                    copy from nullptr if mapping fails
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebGPU
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mwyrzykowski at apple.com

[WebGPU] GPUBuffer::getMappedRange will attempt to copy from nullptr if mapping fails

If mapping fails in the GPU process, then m_mappedRange.source is nullptr and we will attempt to perform a memcpy with a src address of 0

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