[Webkit-unassigned] [Bug 101649] New: m_columnLogicalWidthChanged is manipulating uninitialized memory

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=101649

           Summary: m_columnLogicalWidthChanged is manipulating
                    uninitialized memory
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Tables
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: jchaffraix at webkit.org


Because Vector<int> doesn't initialize the memory it allocates, m_columnPos contains uninitialized memory that we query before setting it in RenderTable::setColumnPosition:

m_columnLogicalWidthChanged |= m_columnPos[index] != position;

As we use the information only to propagate some layout bits to the table parts, this bug is not security sensitive.

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