diff --git a/drivers/infiniband/hw/qib/qib_mad.c b/drivers/infiniband/hw/qib/qib_mad.c
index 549c71971a1f..82d9da9b6997 100644
--- a/drivers/infiniband/hw/qib/qib_mad.c
+++ b/drivers/infiniband/hw/qib/qib_mad.c
@@ -1573,8 +1573,8 @@ static int pma_get_portcounters_cong(struct ib_pma_mad *pmp,
 	cntrs.port_xmit_packets -= ibp->z_port_xmit_packets;
 	cntrs.port_rcv_packets -= ibp->z_port_rcv_packets;
 
-	memset(pmp->reserved, 0, sizeof(pmp->reserved) +
-	       sizeof(pmp->data));
+	memset(pmp->reserved, 0, sizeof(pmp->reserved));
+	memset(pmp->data, 0, sizeof(pmp->data));
 
 	/*
 	 * Set top 3 bits to indicate interval in picoseconds in
diff --git a/drivers/infiniband/hw/qib/qib_ruc.c b/drivers/infiniband/hw/qib/qib_ruc.c
index e6a42a8972f5..53efbb0b40c4 100644
--- a/drivers/infiniband/hw/qib/qib_ruc.c
+++ b/drivers/infiniband/hw/qib/qib_ruc.c
@@ -645,8 +645,10 @@ u32 qib_make_grh(struct qib_ibport *ibp, struct ib_grh *hdr,
 	hdr->hop_limit = grh->hop_limit;
 	/* The SGID is 32-bit aligned. */
 	hdr->sgid.global.subnet_prefix = ibp->rvp.gid_prefix;
-	hdr->sgid.global.interface_id = grh->sgid_index ?
-		ibp->guids[grh->sgid_index - 1] : ppd_from_ibp(ibp)->guid;
+	if (!grh->sgid_index)
+		hdr->sgid.global.interface_id = ppd_from_ibp(ibp)->guid;
+	else if (grh->sgid_index < QIB_GUIDS_PER_PORT)
+		hdr->sgid.global.interface_id = ibp->guids[grh->sgid_index - 1];
 	hdr->dgid = grh->dgid;
 
 	/* GRH header size in 32-bit words. */