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Problem Report 1775 Details

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Report 1775 Actions

    Problem Report Number 1775
    Submitter's Classification Specification problem
    State Resolved
    Resolution Temporary Interpretation (TIN)
    Problem Resolution ID TIN.X.0074
    Raised 1970-01-01 08:00
    Updated 2003-03-13 08:00
    Published 1998-08-12 08:00
    Product Standard X Window System Display
    Certification Program The Open Brand certification program
    Test Suite VSW version 5.0.1
    Test Identification Xt11/XtCallbackReleaseCacheRefList 1
    Specification X Window System Protocol
    Location in Spec See Problem Text
    Problem Summary TIN4W.00008 This submitter claims the test may fail because of a difference between the reference code and the specification.
    Problem Text
    If you look at $VSW/tset/Xt11/tcalbrcrl/tcalbrcrl.m,
    you can see a call to XtAddCallback ...

    XtAddCallback(topLevel,
    XtNdestroyCallback,
    XtCallbackReleaseCacheRefList,
    (XtPointer)cache_ref_return);

    where cache_ref_return has previously been defined as ...

    XtCacheRef cache_ref_return[3]


    XtCallCallbacks() is next and subsequently XtCallbackReleaseCacheRefList
    is called. The sample code for XtCallbackReleaseCacheRefList() is


    /* ARGSUSED */
    void XtCallbackReleaseCacheRefList(widget, closure, call_data)
    Widget widget; /* unused */
    XtPointer closure;
    XtPointer call_data; /* unused */
    {
    XtAppReleaseCacheRefs( XtWidgetToApplicationContext(widget),
    (XtCacheRef*)closure );
    XtFree(closure);
    }

    So, basically we end up calling XtFree for cache_ref_return which is
    obviously not such a good thing to do (considering we didn't alloc it
    in the first place). The application core dumps the next time it tries
    a malloc (in tet_bufchk ... bp = malloc((size_t) newlen); ).
    Test Output
    TEST CASE: XtCallbackReleaseCacheRefList

    TEST PURPOSE #1
    Assertion XtCallbackReleaseCacheRefList-1.(A)
    When added to a callback list with client_data specified as
    a pointer to a NULL-terminated list of XtCacheRef values and
    later invoked, void XtCallbackReleaseCacheRefList(object,
    client_data, call_data) shall decrement the reference counts
    for the conversion entries specified by client_data.
    PREP: Initialize toolkit, Open display and Create topLevel root widget
    PREP: Create windows for widgets and map them
    PREP: Register resource converter
    PREP: Invoke converter twice to cache resources
    TEST: Invoke XtCallbackReleaseCacheRefList callback
    unexpected signal 11 (SIGSEGV) received
    1 UNRESOLVED

    Review Information

    Review Type TSMA Review
    Start Date null
    Completed null
    Status Complete
    Review Recommendation No Resolution Given
    Review Response
    We believe the submitter has identified a problem in the
    reference code. It should not be freeing this memory.

    Thus it is recommended that a Temporary Interpretation be granted
    for this test while it remains subject to review. If a change to
    the specification results from the conclusion of this investigation,
    then this Temporary Interpretation will be converted to a Permanent Waiver.
    Otherwise this Temporary Interpretation will be converted to a Temporary
    Waiver (Minor System Fault).

    Note to TOG: We recommend a problem report be filed against the reference code
    for this issue.

    Review Type SA Review
    Start Date null
    Completed null
    Status Complete
    Review Resolution Temporary Interpretation (TIN)
    Review Conclusion
    A Temporary Interpretation is granted.

    Problem Reporting System Options:

     

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