[Bug 214727] [patch][mfc]NULL dereference in tcp_signature_do_compute

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214727

            Bug ID: 214727
           Summary: [patch][mfc]NULL dereference in
                    tcp_signature_do_compute
           Product: Base System
           Version: 11.0-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Keywords: patch
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: dgilbert at eicat.ca
          Keywords: patch

anyone doing IPv6 BGP will likely run into this.  An IPv6 MD5 packet causes a
panic because of a NULL dereference.

This is fixed in r307726 in HEAD, but the problem exists in at least 11.0p3 and
likely in 11-STABLE, too (although I didn't check).  I think this is serious
enough to be considered ERRATA too ... or even a possible denial-of-service
(although I don't know if you can trigger this without md5 being configured)

anyways MFC 307726.

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