[Bug 250499] [tcp] Should we reject the packet with timestamp if no timestamp in SYN and SYN_ACK?

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=250499

--- Comment #2 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: tuexen
Date: Fri Nov 20 13:00:29 UTC 2020
New revision: 367891
URL: https://svnweb.freebsd.org/changeset/base/367891

Log:
  Fix an issue I introuced in r367530: tcp_twcheck() can be called
  with to == NULL for SYN segments. So don't assume tp != NULL.
  Thanks to jhb@ for reporting and suggesting a fix.

  PR:                   250499
  MFC after:            1 week
  XMFC-with:            r367530
  Sponsored by:         Netflix, Inc.

Changes:
  head/sys/netinet/tcp_timewait.c

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