IB/ipath: Discard multicast packets without a GRH

This patch fixes a bug where multicast packets without a GRH were not
being dropped as per the IB spec.

Signed-off-by: Ralph Campbell <ralph.campbell@qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 5 insertions, 2 deletions

diff --git a/drivers/infiniband/hw/ipath/ipath_verbs.c b/drivers/infiniband/hw/ipath/ipath_verbs.c
index 9bec5a9b4557..f5604b876500 100644
--- a/drivers/infiniband/hw/ipath/ipath_verbs.c
+++ b/drivers/infiniband/hw/ipath/ipath_verbs.c
@@ -438,6 +438,10 @@ void ipath_ib_rcv(struct ipath_ibdev *dev, void *rhdr, void *data,
                 struct ipath_mcast *mcast;
                 struct ipath_mcast_qp *p;
 
+                if (lnh != IPATH_LRH_GRH) {
+                        dev->n_pkt_drops++;
+                        goto bail;
+                }
                 mcast = ipath_mcast_find(&hdr->u.l.grh.dgid);
                 if (mcast == NULL) {
                         dev->n_pkt_drops++;
@@ -445,8 +449,7 @@ void ipath_ib_rcv(struct ipath_ibdev *dev, void *rhdr, void *data,
                 }
                 dev->n_multicast_rcv++;
                 list_for_each_entry_rcu(p, &mcast->qp_list, list)
-                        ipath_qp_rcv(dev, hdr, lnh == IPATH_LRH_GRH, data,
-                                     tlen, p->qp);
+                        ipath_qp_rcv(dev, hdr, 1, data, tlen, p->qp);
                 /*
                  * Notify ipath_multicast_detach() if it is waiting for us
                  * to finish.