[Bug 193762] [cc_cdg] crash after change net.inet.tcp.cc.cdg.smoothing_factor

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=193762

--- Comment #22 from commit-hook at freebsd.org ---
A commit references this bug:

Author: tuexen
Date: Mon Feb 25 12:25:44 UTC 2019
New revision: 344514
URL: https://svnweb.freebsd.org/changeset/base/344514

Log:
  MFC r343920:

  Ensure that when using the TCP CDG congestion control and setting the
  sysctl variable net.inet.tcp.cc.cdg.smoothing_factor to 0, the smoothing
  is disabled. Without this patch, a division by zero orrurs.

  PR:                   193762
  Reviewed by:          lstewart@, rrs@
  Sponsored by:         Netflix, Inc.
  Differential Revision:        https://reviews.freebsd.org/D19071

Changes:
_U  stable/12/
  stable/12/sys/netinet/cc/cc_cdg.c

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