[umbrello] [Bug 425459] New: ToolBarState and associated classes never check UMLScene* for NULL

[Robert Hairgrove]

https://bugs.kde.org/show_bug.cgi?id=425459

            Bug ID: 425459
           Summary: ToolBarState and associated classes never check
                    UMLScene* for NULL
           Product: umbrello
           Version: Git
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: umbrello-devel at kde.org
          Reporter: code at roberthairgrove.com
  Target Milestone: ---

SUMMARY
The class ToolBarStateFactory is responsible for creating instances of
different classes derived from ToolBarState. It is passed a UMLScene* as its
last argument. However, it does not check the pointer for NULL before using it,
which causes undefined behavior if it is NULL.

The pointer to UMLScene is passed on to the derived classes, but apparently,
also none of these other classes check the pointer, either.

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