kern/162997: commit references a PR

[dfilter service]

The following reply was made to PR kern/162997; it has been noted by GNATS.

From: dfilter at FreeBSD.ORG (dfilter service)
To: bug-followup at FreeBSD.org
Cc:  
Subject: Re: kern/162997: commit references a PR
Date: Fri,  2 Dec 2011 17:10:11 +0000 (UTC)

 Author: mav
 Date: Fri Dec  2 17:09:48 2011
 New Revision: 228204
 URL: http://svn.freebsd.org/changeset/base/228204
 
 Log:
   Close race between geom destruction on g_vfs_close() when softc destroyed
   and g_vfs_orphan() call that tries to access softc, intruced at r227015.
   
   PR:		kern/162997
 
 Modified:
   head/sys/geom/geom_vfs.c
 
 Modified: head/sys/geom/geom_vfs.c
 ==============================================================================
 --- head/sys/geom/geom_vfs.c	Fri Dec  2 15:47:05 2011	(r228203)
 +++ head/sys/geom/geom_vfs.c	Fri Dec  2 17:09:48 2011	(r228204)
 @@ -169,8 +169,10 @@ g_vfs_orphan(struct g_consumer *cp)
  	g_topology_assert();
  
  	gp = cp->geom;
 -	sc = gp->softc;
  	g_trace(G_T_TOPOLOGY, "g_vfs_orphan(%p(%s))", cp, gp->name);
 +	sc = gp->softc;
 +	if (sc == NULL)
 +		return;
  	mtx_lock(&sc->sc_mtx);
  	sc->sc_orphaned = 1;
  	destroy = (sc->sc_active == 0);
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