[Bug 222512] [netgraph] ng_con_nodes calls ng_findhook() on unprotected node2

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=222512

            Bug ID: 222512
           Summary: [netgraph] ng_con_nodes calls ng_findhook() on
                    unprotected node2
           Product: Base System
           Version: CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: avg at FreeBSD.org

ng_con_nodes() receives two nodes are parameters, 'node' is referenced and
locked while 'node2' is just referenced.  Calling ng_findhook(node2) is racy
with any hook modifications of node2.

The call should be removed as the check is also done, and with correct locking,
in ng_con_part2().  It's just a little bit too noisy right now.

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