[Bug 234442] libnetgraph race condition

[bugzilla-noreply at freebsd.org]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=234442

Mark Johnston <markj at FreeBSD.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|In Progress                 |Closed

--- Comment #8 from Mark Johnston <markj at FreeBSD.org> ---
I don't have the means to test this on stable/11, but please feel free to MFC
the change there if you can verify that it works.

--- Comment #9 from commit-hook at freebsd.org ---
A commit references this bug:

Author: eugen
Date: Fri Oct 11 18:05:06 UTC 2019
New revision: 353445
URL: https://svnweb.freebsd.org/changeset/base/353445

Log:
  MFC r347439 by markj: Atomically update the global gMsgId in libnetgraph.

  Otherwise concurrently running threads may inadvertently use the same
  token for different messages.

  Preserve the behaviour of disallowing negative message tokens, but allow
  a message token value of zero since this simplifies the code a bit and
  tokens are documented to be non-negative.

  PR:           234442

Changes:
_U  stable/11/
  stable/11/lib/libnetgraph/msg.c

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