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From: "Bjoern A. Zeeb" <bz@FreeBSD.org>
Date: Wed, 21 Apr 2010 19:55:43 +0000 (UTC)
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Subject: svn commit: r207014 - stable/8/sys/net
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Author: bz
Date: Wed Apr 21 19:55:43 2010
New Revision: 207014
URL: http://svn.freebsd.org/changeset/base/207014

Log:
  MFC r206486:
  
    Check that the interface is on the list of cloned interfaces before trying
    to remove it to avoid panics in case of two threads trying to remove it in
    parallel.
  
  PR:	      kern/116837
  Submitted by: Takahiro Kurosawa (takahiro.kurosawa gmail.com) (orig version)

Modified:
  stable/8/sys/net/if_clone.c
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)
  stable/8/sys/dev/xen/xenpci/   (props changed)
  stable/8/sys/geom/sched/   (props changed)

Modified: stable/8/sys/net/if_clone.c
==============================================================================
--- stable/8/sys/net/if_clone.c	Wed Apr 21 19:51:22 2010	(r207013)
+++ stable/8/sys/net/if_clone.c	Wed Apr 21 19:55:43 2010	(r207014)
@@ -234,6 +234,7 @@ int
 if_clone_destroyif(struct if_clone *ifc, struct ifnet *ifp)
 {
 	int err;
+	struct ifnet *ifcifp;
 
 	if (ifc->ifc_destroy == NULL)
 		return(EOPNOTSUPP);
@@ -246,8 +247,17 @@ if_clone_destroyif(struct if_clone *ifc,
 	CURVNET_SET_QUIET(ifp->if_vnet);
 
 	IF_CLONE_LOCK(ifc);
-	IFC_IFLIST_REMOVE(ifc, ifp);
+	LIST_FOREACH(ifcifp, &ifc->ifc_iflist, if_clones) {
+		if (ifcifp == ifp) {
+			IFC_IFLIST_REMOVE(ifc, ifp);
+			break;
+		}
+	}
 	IF_CLONE_UNLOCK(ifc);
+	if (ifcifp == NULL) {
+		CURVNET_RESTORE();
+		return (ENXIO);		/* ifp is not on the list. */
+	}
 
 	if_delgroup(ifp, ifc->ifc_name);