[Webkit-unassigned] [Bug 246260] New: StringImpl::copyCharacters incorrectly uses memcpy on destination pointers that may be null

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=246260

            Bug ID: 246260
           Summary: StringImpl::copyCharacters incorrectly uses memcpy on
                    destination pointers that may be null
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Web Template Framework
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: darin at apple.com

After studying the call sites of StringImpl::copyCharacters, it is clear that many rely on being able to pass a combination of a null pointer for the destination and a zero length. The documentation of std::memcpy makes it clear that this leads to undefined behavior, so we can’t do this any more.

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