[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 #21 from commit-hook at freebsd.org ---
A commit references this bug:

Author: tuexen
Date: Fri Feb  8 20:42:50 UTC 2019
New revision: 343920
URL: https://svnweb.freebsd.org/changeset/base/343920

Log:
  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@
  MFC after:            3 days
  Sponsored by:         Netflix, Inc.
  Differential Revision:        https://reviews.freebsd.org/D19071

Changes:
  head/sys/netinet/cc/cc_cdg.c

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