Merge pull request #44 from adamdunkels/rime-nullptr-guard

Rime NULL pointer guards

core/net/rime/abc.c

@@ -93,7 +93,9 @@ abc_input(struct channel *channel)
 	 rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
 	 channel->channelno);
 
-  c->u->recv(c);
+  if(c->u->recv) {
+    c->u->recv(c);
+  }
 }
 /*---------------------------------------------------------------------------*/
 void

core/net/rime/broadcast.c

@@ -70,7 +70,9 @@ recv_from_abc(struct abc_conn *bc)
   PRINTF("%d.%d: broadcast: from %d.%d\n",
 	 rimeaddr_node_addr.u8[0],rimeaddr_node_addr.u8[1],
 	 sender.u8[0], sender.u8[1]);
-  c->u->recv(c, &sender);
+  if(c->u->recv) {
+    c->u->recv(c, &sender);
+  }
 }
 /*---------------------------------------------------------------------------*/
 static void

core/net/rime/collect-link-estimate.c

@@ -62,6 +62,9 @@
 void
 collect_link_estimate_new(struct collect_link_estimate *le)
 {
+  if(le == NULL) {
+    return;
+  }
   le->num_estimates = 0;
   le->etx_accumulator = COLLECT_LINK_ESTIMATE_UNIT;
 }
@@ -69,6 +72,9 @@ collect_link_estimate_new(struct collect_link_estimate *le)
 void
 collect_link_estimate_update_tx(struct collect_link_estimate *le, uint8_t tx)
 {
+  if(le == NULL) {
+    return;
+  }
   if(tx == 0) {
     /*    printf("ERROR tx == 0\n");*/
     return;
@@ -95,6 +101,9 @@ void
 collect_link_estimate_update_tx_fail(struct collect_link_estimate *le,
                                      uint8_t tx)
 {
+  if(le == NULL) {
+    return;
+  }
   collect_link_estimate_update_tx(le, tx * 2);
 }
 /*---------------------------------------------------------------------------*/
@@ -107,6 +116,9 @@ collect_link_estimate_update_rx(struct collect_link_estimate *n)
 uint16_t
 collect_link_estimate(struct collect_link_estimate *le)
 {
+  if(le == NULL) {
+    return 0;
+  }
   if(le->num_estimates == 0) {
     return INITIAL_LINK_ESTIMATE * COLLECT_LINK_ESTIMATE_UNIT;
   }

core/net/rime/collect-neighbor.c

@@ -129,6 +129,9 @@ collect_neighbor_list_find(struct collect_neighbor_list *neighbors_list,
                            const rimeaddr_t *addr)
 {
   struct collect_neighbor *n;
+  if(neighbors_list == NULL) {
+    return NULL;
+  }
   for(n = list_head(neighbors_list->list); n != NULL; n = list_item_next(n)) {
     if(rimeaddr_cmp(&n->addr, addr)) {
       return n;
@@ -148,6 +151,10 @@ collect_neighbor_list_add(struct collect_neighbor_list *neighbors_list,
     return 0;
   }
 
+  if(neighbors_list == NULL) {
+    return 0;
+  }
+
   PRINTF("collect_neighbor_add: adding %d.%d\n", addr->u8[0], addr->u8[1]);
 
   /* Check if the collect_neighbor is already on the list. */
@@ -219,6 +226,10 @@ collect_neighbor_list_add(struct collect_neighbor_list *neighbors_list,
 list_t
 collect_neighbor_list(struct collect_neighbor_list *neighbors_list)
 {
+  if(neighbors_list == NULL) {
+    return NULL;
+  }
+
   return neighbors_list->list;
 }
 /*---------------------------------------------------------------------------*/
@@ -226,7 +237,13 @@ void
 collect_neighbor_list_remove(struct collect_neighbor_list *neighbors_list,
                              const rimeaddr_t *addr)
 {
-  struct collect_neighbor *n = collect_neighbor_list_find(neighbors_list, addr);
+  struct collect_neighbor *n;
+
+  if(neighbors_list == NULL) {
+    return;
+  }
+
+  n = collect_neighbor_list_find(neighbors_list, addr);
 
   if(n != NULL) {
     list_remove(neighbors_list->list, n);
@@ -245,6 +262,10 @@ collect_neighbor_list_best(struct collect_neighbor_list *neighbors_list)
   best = NULL;
   found = 0;
 
+  if(neighbors_list == NULL) {
+    return NULL;
+  }
+
   /*  PRINTF("%d: ", node_id);*/
   PRINTF("collect_neighbor_best: ");
 
@@ -267,6 +288,10 @@ collect_neighbor_list_best(struct collect_neighbor_list *neighbors_list)
 int
 collect_neighbor_list_num(struct collect_neighbor_list *neighbors_list)
 {
+  if(neighbors_list == NULL) {
+    return 0;
+  }
+
   PRINTF("collect_neighbor_num %d\n", list_length(neighbors_list->list));
   return list_length(neighbors_list->list);
 }
@@ -277,6 +302,10 @@ collect_neighbor_list_get(struct collect_neighbor_list *neighbors_list, int num)
   int i;
   struct collect_neighbor *n;
 
+  if(neighbors_list == NULL) {
+    return NULL;
+  }
+
   PRINTF("collect_neighbor_get %d\n", num);
 
   i = 0;
@@ -294,6 +323,10 @@ collect_neighbor_list_get(struct collect_neighbor_list *neighbors_list, int num)
 void
 collect_neighbor_list_purge(struct collect_neighbor_list *neighbors_list)
 {
+  if(neighbors_list == NULL) {
+    return;
+  }
+
   while(list_head(neighbors_list->list) != NULL) {
     memb_free(&collect_neighbors_mem, list_pop(neighbors_list->list));
   }
@@ -314,6 +347,9 @@ collect_neighbor_update_rtmetric(struct collect_neighbor *n, uint16_t rtmetric)
 void
 collect_neighbor_tx_fail(struct collect_neighbor *n, uint16_t num_tx)
 {
+  if(n == NULL) {
+    return;
+  }
   collect_link_estimate_update_tx_fail(&n->le, num_tx);
   n->le_age = 0;
   n->age = 0;
@@ -322,6 +358,9 @@ collect_neighbor_tx_fail(struct collect_neighbor *n, uint16_t num_tx)
 void
 collect_neighbor_tx(struct collect_neighbor *n, uint16_t num_tx)
 {
+  if(n == NULL) {
+    return;
+  }
   collect_link_estimate_update_tx(&n->le, num_tx);
   n->le_age = 0;
   n->age = 0;
@@ -330,6 +369,9 @@ collect_neighbor_tx(struct collect_neighbor *n, uint16_t num_tx)
 void
 collect_neighbor_rx(struct collect_neighbor *n)
 {
+  if(n == NULL) {
+    return;
+  }
   collect_link_estimate_update_rx(&n->le);
   n->age = 0;
 }
@@ -337,6 +379,9 @@ collect_neighbor_rx(struct collect_neighbor *n)
 uint16_t
 collect_neighbor_link_estimate(struct collect_neighbor *n)
 {
+  if(n == NULL) {
+    return 0;
+  }
   if(collect_neighbor_is_congested(n)) {
     /*    printf("Congested %d.%d, sould return %d, returning %d\n",
            n->addr.u8[0], n->addr.u8[1],
@@ -351,24 +396,38 @@ collect_neighbor_link_estimate(struct collect_neighbor *n)
 uint16_t
 collect_neighbor_rtmetric_link_estimate(struct collect_neighbor *n)
 {
+  if(n == NULL) {
+    return 0;
+  }
   return n->rtmetric + collect_link_estimate(&n->le);
 }
 /*---------------------------------------------------------------------------*/
 uint16_t
 collect_neighbor_rtmetric(struct collect_neighbor *n)
 {
+  if(n == NULL) {
+    return 0;
+  }
+
   return n->rtmetric;
 }
 /*---------------------------------------------------------------------------*/
 void
 collect_neighbor_set_congested(struct collect_neighbor *n)
 {
+  if(n == NULL) {
+    return;
+  }
   timer_set(&n->congested_timer, EXPECTED_CONGESTION_DURATION);
 }
 /*---------------------------------------------------------------------------*/
 int
 collect_neighbor_is_congested(struct collect_neighbor *n)
 {
+  if(n == NULL) {
+    return 0;
+  }
+
   if(timer_expired(&n->congested_timer)) {
     return 0;
   } else {

core/net/rime/collect.c

@@ -814,8 +814,10 @@ handle_ack(struct collect_conn *tc)
        chance that another parent will be chosen. */
     if(msg.flags & ACK_FLAGS_CONGESTED) {
       PRINTF("ACK flag indicated parent was congested.\n");
-      collect_neighbor_set_congested(n);
-      collect_neighbor_tx(n, tc->max_rexmits * 2);
+      if(n != NULL) {
+	collect_neighbor_set_congested(n);
+	collect_neighbor_tx(n, tc->max_rexmits * 2);
+      }
       update_rtmetric(tc);
     }
     if((msg.flags & ACK_FLAGS_DROPPED) == 0) {

core/net/rime/unicast.c

@@ -72,7 +72,9 @@ recv_from_broadcast(struct broadcast_conn *broadcast, const rimeaddr_t *from)
 	 packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[0],
 	 packetbuf_addr(PACKETBUF_ADDR_RECEIVER)->u8[1]);
   if(rimeaddr_cmp(packetbuf_addr(PACKETBUF_ADDR_RECEIVER), &rimeaddr_node_addr)) {
-    c->u->recv(c, from);
+    if(c->u->recv) {
+      c->u->recv(c, from);
+    }
   }
 }
 /*---------------------------------------------------------------------------*/