Author: thompsa
Date: Thu Jul 7 20:02:09 2011
New Revision: 223846
URL: http://svn.freebsd.org/changeset/base/223846
Log:
Grab the rlock before checking if our interface is enabled, it could be
possible to hit a dead pointer when changing interfaces.
PR: kern/156978
Submitted by: Andrew Boyer
MFC after: 1 week
Modified:
head/sys/net/if_lagg.c
Modified: head/sys/net/if_lagg.c
==============================================================================
--- head/sys/net/if_lagg.c Thu Jul 7 18:07:03 2011 (r223845)
+++ head/sys/net/if_lagg.c Thu Jul 7 20:02:09 2011 (r223846)
@@ -1221,14 +1221,15 @@ lagg_input(struct ifnet *ifp, struct mbu
struct lagg_softc *sc = lp->lp_softc;
struct ifnet *scifp = sc->sc_ifp;
+ LAGG_RLOCK(sc);
if ((scifp->if_drv_flags & IFF_DRV_RUNNING) == 0 ||
(lp->lp_flags & LAGG_PORT_DISABLED) ||
sc->sc_proto == LAGG_PROTO_NONE) {
+ LAGG_RUNLOCK(sc);
m_freem(m);
return (NULL);
}
- LAGG_RLOCK(sc);
ETHER_BPF_MTAP(scifp, m);
m = (*sc->sc_input)(sc, lp, m);
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