[Webkit-unassigned] [Bug 93078] New: SharedBuffer::copy() can cause segmentation fault.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=93078

           Summary: SharedBuffer::copy() can cause segmentation fault.
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Unspecified
        OS/Version: Unspecified
            Status: UNCONFIRMED
          Severity: Normal
          Priority: P2
         Component: Platform
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: luxtella at company100.net


After SharedBuffer::copy(), SharedBuffer::append() often causes segmentation fault,
because copy() calls clone->m_buffer.append(m_segments[i], segmentSize) even if
'i' is the last index. The data size of m_segments.last() is often less than
segmentSize. So, in the cloned instance m_size < (m_buffer.size() + SUM(m_segments[i].size())).
This patch appends the exact size of the last segment instead of segmentSize.

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