[Bug 197246] [patch] use-after-free bug in pipe_dtor()

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197246

            Bug ID: 197246
           Summary: [patch] use-after-free bug in pipe_dtor()
           Product: Base System
           Version: 11.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: luke.tw at gmail.com

Created attachment 152442
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=152442&action=edit
patch for pipd_dtor()

There is a use-after-free bug in pipe_dtor(). This will result in kernel panic
when memguard is enabled.

* free
  pipeclose(dpipe)
  -> uma_zfree(pipe_zone, cpipe->pipe_pair);

* use
  if (dpipe->pipe_state & PIPE_NAMED) {


I attach a patch to fix this bug.

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