[Webkit-unassigned] [Bug 189154] New: Add nullptr check to String::is8Bit()

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189154

            Bug ID: 189154
           Summary: Add nullptr check to String::is8Bit()
           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

A default initialized or null string wraps a nullptr StringImpl. Most accessors in WTFString.cpp, such as isAllASCII(), hash(), etc., perform a nullptr check before using m_impl, but is8Bit() does not.

This patch adds a check in the is8Bit() implementation to be consistent with other methods, and to address a small number of crashes observed in testing.

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