Author: bz
Date: Sun Apr 11 18:41:31 2010
New Revision: 206486
URL: http://svn.freebsd.org/changeset/base/206486
Log:
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)
MFC after: 10 days
Modified:
head/sys/net/if_clone.c
Modified: head/sys/net/if_clone.c
==============================================================================
--- head/sys/net/if_clone.c Sun Apr 11 16:28:10 2010 (r206485)
+++ head/sys/net/if_clone.c Sun Apr 11 18:41:31 2010 (r206486)
@@ -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);
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