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Date:      Fri, 22 Sep 2017 09:01:44 +0000
From:      bugzilla-noreply@freebsd.org
To:        freebsd-bugs@FreeBSD.org
Subject:   [Bug 222512] [netgraph] ng_con_nodes calls ng_findhook() on unprotected node2
Message-ID:  <bug-222512-8@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D222512

            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@FreeBSD.org
          Reporter: avg@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 lock=
ing,
in ng_con_part2().  It's just a little bit too noisy right now.

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