diff --git a/ospfd/ospf_flood.c b/ospfd/ospf_flood.c
index 848f340750..fb3fb21e08 100644
--- a/ospfd/ospf_flood.c
+++ b/ospfd/ospf_flood.c
@@ -638,13 +638,15 @@ int ospf_flood_through_interface(struct ospf_interface *oi,
 	if (oi->type == OSPF_IFTYPE_NBMA) {
 		struct ospf_neighbor *nbr;
 
-		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
-			if ((nbr = rn->info) != NULL)
-				if (nbr != oi->nbr_self
-				    && nbr->state >= NSM_Exchange)
-					ospf_ls_upd_send_lsa(
-						nbr, lsa,
-						OSPF_SEND_PACKET_DIRECT);
+		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
+			nbr = rn->info;
+
+			if (!nbr)
+				continue;
+			if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange)
+				ospf_ls_upd_send_lsa(nbr, lsa,
+						     OSPF_SEND_PACKET_DIRECT);
+		}
 	} else
 		ospf_ls_upd_send_lsa(oi->nbr_self, lsa,
 				     OSPF_SEND_PACKET_INDIRECT);
@@ -991,18 +993,20 @@ static void ospf_ls_retransmit_delete_nbr_if(struct ospf_interface *oi,
 	struct ospf_lsa *lsr;
 
 	if (ospf_if_is_enable(oi))
-		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
+		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
 			/* If LSA find in LS-retransmit list, then remove it. */
-			if ((nbr = rn->info) != NULL) {
-				lsr = ospf_ls_retransmit_lookup(nbr, lsa);
+			nbr = rn->info;
 
-				/* If LSA find in ls-retransmit list, remove it.
-				 */
-				if (lsr != NULL
-				    && lsr->data->ls_seqnum
-					       == lsa->data->ls_seqnum)
-					ospf_ls_retransmit_delete(nbr, lsr);
-			}
+			if (!nbr)
+				continue;
+
+			lsr = ospf_ls_retransmit_lookup(nbr, lsa);
+
+			/* If LSA find in ls-retransmit list, remove it. */
+			if (lsr != NULL &&
+			    lsr->data->ls_seqnum == lsa->data->ls_seqnum)
+				ospf_ls_retransmit_delete(nbr, lsr);
+		}
 }
 
 void ospf_ls_retransmit_delete_nbr_area(struct ospf_area *area,
diff --git a/ospfd/ospf_interface.c b/ospfd/ospf_interface.c
index 633ab05131..a4f4cd216a 100644
--- a/ospfd/ospf_interface.c
+++ b/ospfd/ospf_interface.c
@@ -66,15 +66,16 @@ int ospf_interface_neighbor_count(struct ospf_interface *oi)
 
 	for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
 		nbr = rn->info;
-		if (nbr) {
-			/* Do not show myself. */
-			if (nbr == oi->nbr_self)
-				continue;
-			/* Down state is not shown. */
-			if (nbr->state == NSM_Down)
-				continue;
-			count++;
-		}
+		if (!nbr)
+			continue;
+
+		/* Do not show myself. */
+		if (nbr == oi->nbr_self)
+			continue;
+		/* Down state is not shown. */
+		if (nbr->state == NSM_Down)
+			continue;
+		count++;
 	}
 
 	return count;
@@ -315,10 +316,11 @@ void ospf_if_cleanup(struct ospf_interface *oi)
 	}
 
 	/* send Neighbor event KillNbr to all associated neighbors. */
-	for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
+	for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
 		if ((nbr = rn->info) != NULL)
 			if (nbr != oi->nbr_self)
 				OSPF_NSM_EVENT_EXECUTE(nbr, NSM_KillNbr);
+	}
 
 	/* Cleanup Link State Acknowlegdment list. */
 	for (ALL_LIST_ELEMENTS(oi->ls_ack, node, nnode, lsa))
diff --git a/ospfd/ospf_packet.c b/ospfd/ospf_packet.c
index 907cb15ed5..c5e26fa371 100644
--- a/ospfd/ospf_packet.c
+++ b/ospfd/ospf_packet.c
@@ -3349,49 +3349,44 @@ static int ospf_make_hello(struct ospf_interface *oi, struct stream *s)
 	stream_put_ipv4(s, BDR(oi).s_addr);
 
 	/* Add neighbor seen. */
-	for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
-		if ((nbr = rn->info))
-			if (nbr->router_id.s_addr
-			    != INADDR_ANY) /* Ignore 0.0.0.0 node. */
-				if (nbr->state
-				    != NSM_Attempt) /* Ignore Down neighbor. */
-					if (nbr->state
-					    != NSM_Down) /* This is myself for
-							    DR election. */
-						if (!IPV4_ADDR_SAME(
-							    &nbr->router_id,
-							    &oi->ospf->router_id)) {
-							/* Check neighbor is
-							 * sane? */
-							if (nbr->d_router.s_addr
-								    != INADDR_ANY
-							    && IPV4_ADDR_SAME(
-								    &nbr->d_router,
-								    &oi->address
-									     ->u
-									     .prefix4)
-							    && IPV4_ADDR_SAME(
-								    &nbr->bd_router,
-								    &oi->address
-									     ->u
-									     .prefix4))
-								flag = 1;
+	for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
+		nbr = rn->info;
 
-							/* Hello packet overflows interface MTU. */
-							if (length + sizeof(uint32_t)
-								> ospf_packet_max(oi)) {
-								flog_err(
-									EC_OSPF_LARGE_HELLO,
-									"Oversized Hello packet! Larger than MTU. Not sending it out");
-								return 0;
-							}
+		if (!nbr)
+			continue;
 
-							stream_put_ipv4(
-								s,
-								nbr->router_id
-									.s_addr);
-							length += 4;
-						}
+		/* Ignore the 0.0.0.0 node */
+		if (nbr->router_id.s_addr == INADDR_ANY)
+			continue;
+
+		/* Ignore Down neighbor */
+		if (nbr->state == NSM_Attempt)
+			continue;
+
+		/* This is myself for DR election */
+		if (nbr->state == NSM_Down)
+			continue;
+
+		if (IPV4_ADDR_SAME(&nbr->router_id, &oi->ospf->router_id))
+			continue;
+		/* Check neighbor is  sane? */
+		if (nbr->d_router.s_addr != INADDR_ANY &&
+		    IPV4_ADDR_SAME(&nbr->d_router, &oi->address->u.prefix4) &&
+		    IPV4_ADDR_SAME(&nbr->bd_router, &oi->address->u.prefix4))
+			flag = 1;
+
+		/* Hello packet overflows interface MTU.
+		 */
+		if (length + sizeof(uint32_t) > ospf_packet_max(oi)) {
+			flog_err(
+				EC_OSPF_LARGE_HELLO,
+				"Oversized Hello packet! Larger than MTU. Not sending it out");
+			return 0;
+		}
+
+		stream_put_ipv4(s, nbr->router_id.s_addr);
+		length += 4;
+	}
 
 	/* Let neighbor generate BackupSeen. */
 	if (flag == 1)
@@ -3772,54 +3767,44 @@ void ospf_hello_send(struct ospf_interface *oi)
 		struct ospf_neighbor *nbr;
 		struct route_node *rn;
 
-		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
-			if ((nbr = rn->info))
-				if (nbr != oi->nbr_self)
-					if (nbr->state != NSM_Down) {
-						/*  RFC 2328  Section 9.5.1
-						    If the router is not
-						   eligible to become Designated
-						   Router,
-						    it must periodically send
-						   Hello Packets to both the
-						    Designated Router and the
-						   Backup Designated Router (if
-						   they
-						    exist).  */
-						if (PRIORITY(oi) == 0
-						    && IPV4_ADDR_CMP(
-							       &DR(oi),
-							       &nbr->address.u
-									.prefix4)
-						    && IPV4_ADDR_CMP(
-							       &BDR(oi),
-							       &nbr->address.u
-									.prefix4))
-							continue;
+		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
+			nbr = rn->info;
+			if (!nbr)
+				continue;
 
-						/*  If the router is eligible to
-						   become Designated Router, it
-						    must periodically send Hello
-						   Packets to all neighbors that
-						    are also eligible. In
-						   addition, if the router is
-						   itself the
-						    Designated Router or Backup
-						   Designated Router, it must
-						   also
-						    send periodic Hello Packets
-						   to all other neighbors. */
+			if (nbr == oi->nbr_self)
+				continue;
 
-						if (nbr->priority == 0
-						    && oi->state == ISM_DROther)
-							continue;
-						/* if oi->state == Waiting, send
-						 * hello to all neighbors */
-						ospf_hello_send_sub(
-							oi,
-							nbr->address.u.prefix4
-								.s_addr);
-					}
+			if (nbr->state == NSM_Down)
+				continue;
+
+			/*
+			 * RFC 2328  Section 9.5.1
+			 * If the router is not eligible to become Designated
+			 * Router, it must periodically send Hello Packets to
+			 * both the Designated Router and the Backup
+			 * Designated Router (if they exist).
+			 */
+			if (PRIORITY(oi) == 0 &&
+			    IPV4_ADDR_CMP(&DR(oi), &nbr->address.u.prefix4) &&
+			    IPV4_ADDR_CMP(&BDR(oi), &nbr->address.u.prefix4))
+				continue;
+
+			/*
+			 * If the router is eligible to become Designated
+			 * Router, it must periodically send Hello Packets to
+			 * all neighbors that are also eligible. In addition,
+			 * if the router is itself the Designated Router or
+			 * Backup Designated Router, it must also send periodic
+			 * Hello Packets to all other neighbors.
+			 */
+			if (nbr->priority == 0 && oi->state == ISM_DROther)
+				continue;
+
+			/* if oi->state == Waiting, send
+			 * hello to all neighbors */
+			ospf_hello_send_sub(oi, nbr->address.u.prefix4.s_addr);
+		}
 	} else {
 		/* Decide destination address. */
 		if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
@@ -4291,14 +4276,18 @@ void ospf_ls_ack_send_delayed(struct ospf_interface *oi)
 		struct ospf_neighbor *nbr;
 		struct route_node *rn;
 
-		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
-			if ((nbr = rn->info) != NULL)
-				if (nbr != oi->nbr_self
-				    && nbr->state >= NSM_Exchange)
-					while (listcount(oi->ls_ack))
-						ospf_ls_ack_send_list(
-							oi, oi->ls_ack,
-							nbr->address.u.prefix4);
+		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
+			nbr = rn->info;
+
+			if (!nbr)
+				continue;
+
+			if (nbr != oi->nbr_self && nbr->state >= NSM_Exchange)
+				while (listcount(oi->ls_ack))
+					ospf_ls_ack_send_list(
+						oi, oi->ls_ack,
+						nbr->address.u.prefix4);
+		}
 		return;
 	}
 	if (oi->type == OSPF_IFTYPE_VIRTUALLINK)
diff --git a/ospfd/ospf_sr.c b/ospfd/ospf_sr.c
index 2c7c80686c..3a71e55710 100644
--- a/ospfd/ospf_sr.c
+++ b/ospfd/ospf_sr.c
@@ -756,13 +756,14 @@ static struct ospf_neighbor *get_neighbor_by_addr(struct ospf *top,
 	for (ALL_LIST_ELEMENTS_RO(top->oiflist, node, oi))
 		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
 			nbr = rn->info;
-			if (nbr)
-				if (IPV4_ADDR_SAME(&nbr->address.u.prefix4,
-						   &addr)
-				    || IPV4_ADDR_SAME(&nbr->router_id, &addr)) {
-					route_unlock_node(rn);
-					return nbr;
-				}
+			if (!nbr)
+				continue;
+
+			if (IPV4_ADDR_SAME(&nbr->address.u.prefix4, &addr) ||
+			    IPV4_ADDR_SAME(&nbr->router_id, &addr)) {
+				route_unlock_node(rn);
+				return nbr;
+			}
 		}
 	return NULL;
 }
diff --git a/ospfd/ospf_vty.c b/ospfd/ospf_vty.c
index 1c22fad669..74ee37b182 100644
--- a/ospfd/ospf_vty.c
+++ b/ospfd/ospf_vty.c
@@ -4476,19 +4476,22 @@ static void show_ip_ospf_neighbor_sub(struct vty *vty,
 	struct ospf_neighbor *nbr, *prev_nbr = NULL;
 
 	for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
-		if ((nbr = rn->info)) {
-			/* Do not show myself. */
-			if (nbr == oi->nbr_self)
-				continue;
-			/* Down state is not shown. */
-			if (nbr->state == NSM_Down)
-				continue;
+		nbr = rn->info;
 
-			prev_nbr = nbr;
+		if (!nbr)
+			continue;
 
-			show_ip_ospf_neighbour_brief(vty, nbr, prev_nbr, json,
-						     use_json);
-		}
+		/* Do not show myself. */
+		if (nbr == oi->nbr_self)
+			continue;
+		/* Down state is not shown. */
+		if (nbr->state == NSM_Down)
+			continue;
+
+		prev_nbr = nbr;
+
+		show_ip_ospf_neighbour_brief(vty, nbr, prev_nbr, json,
+					     use_json);
 	}
 }
 
@@ -5402,14 +5405,17 @@ static int show_ip_ospf_neighbor_id_common(struct vty *vty, struct ospf *ospf,
 	ospf_show_vrf_name(ospf, vty, json, use_vrf);
 
 	for (ALL_LIST_ELEMENTS_RO(ospf->oiflist, node, oi)) {
-		if ((nbr = ospf_nbr_lookup_by_routerid(oi->nbrs, router_id))) {
-			if (is_detail)
-				show_ip_ospf_neighbor_detail_sub(
-					vty, oi, nbr, NULL, json, use_json);
-			else
-				show_ip_ospf_neighbour_brief(vty, nbr, NULL,
-							     json, use_json);
-		}
+		nbr = ospf_nbr_lookup_by_routerid(oi->nbrs, router_id);
+
+		if (!nbr)
+			continue;
+
+		if (is_detail)
+			show_ip_ospf_neighbor_detail_sub(vty, oi, nbr, NULL,
+							 json, use_json);
+		else
+			show_ip_ospf_neighbour_brief(vty, nbr, NULL, json,
+						     use_json);
 	}
 
 	if (use_json)
@@ -5498,16 +5504,19 @@ static int show_ip_ospf_neighbor_detail_common(struct vty *vty,
 		struct ospf_neighbor *nbr, *prev_nbr = NULL;
 
 		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
-			if ((nbr = rn->info)) {
-				if (nbr != oi->nbr_self) {
-					if (nbr->state != NSM_Down) {
-						show_ip_ospf_neighbor_detail_sub(
-							vty, oi, nbr, prev_nbr,
-							json_nbr_sub, use_json);
-					}
+			nbr = rn->info;
+
+			if (!nbr)
+				continue;
+
+			if (nbr != oi->nbr_self) {
+				if (nbr->state != NSM_Down) {
+					show_ip_ospf_neighbor_detail_sub(
+						vty, oi, nbr, prev_nbr,
+						json_nbr_sub, use_json);
 				}
-				prev_nbr = nbr;
 			}
+			prev_nbr = nbr;
 		}
 	}
 
@@ -5668,27 +5677,29 @@ static int show_ip_ospf_neighbor_detail_all_common(struct vty *vty,
 		struct ospf_nbr_nbma *nbr_nbma;
 
 		for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
-			if ((nbr = rn->info)) {
-				if (nbr != oi->nbr_self)
-					if (nbr->state != NSM_Down)
-						show_ip_ospf_neighbor_detail_sub(
-							vty, oi, rn->info,
-							prev_nbr,
-							json_vrf, use_json);
-				prev_nbr = nbr;
-			}
+			nbr = rn->info;
+
+			if (!nbr)
+				continue;
+
+			if (nbr != oi->nbr_self)
+				if (nbr->state != NSM_Down)
+					show_ip_ospf_neighbor_detail_sub(
+						vty, oi, rn->info, prev_nbr,
+						json_vrf, use_json);
+			prev_nbr = nbr;
 		}
 
-		if (oi->type == OSPF_IFTYPE_NBMA) {
-			struct listnode *nd;
+		if (oi->type != OSPF_IFTYPE_NBMA)
+			continue;
 
-			for (ALL_LIST_ELEMENTS_RO(oi->nbr_nbma, nd, nbr_nbma)) {
-				if (nbr_nbma->nbr == NULL
-				    || nbr_nbma->nbr->state == NSM_Down)
-					show_ip_ospf_nbr_nbma_detail_sub(
-						vty, oi, nbr_nbma, use_json,
-						json_vrf);
-			}
+		struct listnode *nd;
+
+		for (ALL_LIST_ELEMENTS_RO(oi->nbr_nbma, nd, nbr_nbma)) {
+			if (nbr_nbma->nbr == NULL ||
+			    nbr_nbma->nbr->state == NSM_Down)
+				show_ip_ospf_nbr_nbma_detail_sub(
+					vty, oi, nbr_nbma, use_json, json_vrf);
 		}
 	}
 
@@ -5853,19 +5864,25 @@ static int show_ip_ospf_neighbor_int_detail_common(struct vty *vty,
 	}
 
 	for (rn = route_top(IF_OIFS(ifp)); rn; rn = route_next(rn)) {
-		if ((oi = rn->info)) {
-			for (nrn = route_top(oi->nbrs); nrn;
-			     nrn = route_next(nrn)) {
-				if ((nbr = nrn->info)) {
-					if (nbr != oi->nbr_self) {
-						if (nbr->state != NSM_Down)
-							show_ip_ospf_neighbor_detail_sub(
-								vty, oi, nbr,
-								NULL,
-								json, use_json);
-					}
-				}
-			}
+		oi = rn->info;
+
+		if (!oi)
+			continue;
+
+		for (nrn = route_top(oi->nbrs); nrn; nrn = route_next(nrn)) {
+			nbr = nrn->info;
+
+			if (!nbr)
+				continue;
+
+			if (nbr == oi->nbr_self)
+				continue;
+
+			if (nbr->state == NSM_Down)
+				continue;
+
+			show_ip_ospf_neighbor_detail_sub(vty, oi, nbr, NULL,
+							 json, use_json);
 		}
 	}
 
@@ -8019,13 +8036,17 @@ static void ospf_nbr_timer_update(struct ospf_interface *oi)
 	struct route_node *rn;
 	struct ospf_neighbor *nbr;
 
-	for (rn = route_top(oi->nbrs); rn; rn = route_next(rn))
-		if ((nbr = rn->info)) {
-			nbr->v_inactivity = OSPF_IF_PARAM(oi, v_wait);
-			nbr->v_db_desc = OSPF_IF_PARAM(oi, retransmit_interval);
-			nbr->v_ls_req = OSPF_IF_PARAM(oi, retransmit_interval);
-			nbr->v_ls_upd = OSPF_IF_PARAM(oi, retransmit_interval);
-		}
+	for (rn = route_top(oi->nbrs); rn; rn = route_next(rn)) {
+		nbr = rn->info;
+
+		if (!nbr)
+			continue;
+
+		nbr->v_inactivity = OSPF_IF_PARAM(oi, v_wait);
+		nbr->v_db_desc = OSPF_IF_PARAM(oi, retransmit_interval);
+		nbr->v_ls_req = OSPF_IF_PARAM(oi, retransmit_interval);
+		nbr->v_ls_upd = OSPF_IF_PARAM(oi, retransmit_interval);
+	}
 }
 
 static int ospf_vty_dead_interval_set(struct vty *vty, const char *interval_str,