dereference null value issue fixed. (ARMmbed#1557)

Author: deepakvenugopal

source/6LoWPAN/Thread/thread_common.c

@@ -1920,21 +1920,17 @@ void thread_mcast_group_change(struct protocol_interface_info_entry *interface,
     }
 }
 
-void thread_old_partition_data_purge(thread_info_t *thread_info)
+void thread_old_partition_data_purge(protocol_interface_info_entry_t *cur)
 {
-    protocol_interface_info_entry_t *cur;
-
     /* Partition has been changed. Wipe out data related to old partition */
-    thread_management_client_pending_coap_request_kill(thread_info->interface_id);
+    thread_management_client_pending_coap_request_kill(cur->id);
 
     /* Reset previous routing information */
-    thread_routing_reset(&thread_info->routing);
-
-    /* Clear previous context ID's */
-    cur = protocol_stack_interface_info_get_by_id(thread_info->interface_id);
+    thread_routing_reset(&cur->thread_info->routing);
 
     /* Flush address cache */
     ipv6_neighbour_cache_flush(&cur->ipv6_neighbour_cache);
+
 }
 
 #endif

source/6LoWPAN/Thread/thread_common.h

@@ -412,7 +412,7 @@ uint8_t thread_pending_timestamp_tlv_size(protocol_interface_info_entry_t *cur);
 void thread_calculate_key_guard_timer(protocol_interface_info_entry_t *cur, link_configuration_s *linkConfiguration, bool is_init);
 void thread_set_link_local_address(protocol_interface_info_entry_t *cur);
 void thread_mcast_group_change(struct protocol_interface_info_entry *interface, struct if_group_entry *group, bool group_added);
-void thread_old_partition_data_purge(thread_info_t *thread_info);
+void thread_old_partition_data_purge(protocol_interface_info_entry_t *cur);
 
 #else // HAVE_THREAD
 

source/6LoWPAN/Thread/thread_leader_service.c

@@ -1317,7 +1317,7 @@ static void thread_leader_service_interface_setup_activate(protocol_interface_in
     thread_leader_service_private_routemask_init(private);
     //SET Router ID
     thread_leader_allocate_router_id_by_allocated_id(private, routerId, cur->mac);
-    thread_old_partition_data_purge(cur->thread_info);
+    thread_old_partition_data_purge(cur);
     cur->lowpan_address_mode = NET_6LOWPAN_GP16_ADDRESS;
     thread_bootstrap_update_ml16_address(cur, cur->thread_info->routerShortAddress);
     thread_generate_ml64_address(cur);

source/6LoWPAN/Thread/thread_lowpower_api.c

@@ -444,7 +444,6 @@ void thread_lowpower_process_response(uint8_t *src_address,int8_t instance_id, u
     (void) instance_id;
     mle_tlv_info_t linkMetricsReport;
     if (memcmp(src_address, data_response_ptr->destination_address, 16) != 0) {
-        tr_debug("Data response not for me");
         return;
     }
 

source/6LoWPAN/Thread/thread_mle_message_handler.c

@@ -351,7 +351,7 @@ static void thread_parse_advertisement(protocol_interface_info_entry_t *cur, mle
             if ((thread_info(cur)->thread_leader_data->partitionId != leaderData.partitionId) ||
                 (thread_info(cur)->thread_leader_data->weighting != leaderData.weighting)) {
                 //parent changed partition/weight - reset own routing information
-                thread_old_partition_data_purge(cur->thread_info);
+                thread_old_partition_data_purge(cur);
             }
             //check if network data needs to be requested
             if (!thread_bootstrap_request_network_data(cur, &leaderData, shortAddress)) {
@@ -577,7 +577,7 @@ static void thread_parse_data_response(protocol_interface_info_entry_t *cur, mle
     if (thread_info(cur)->thread_leader_data->partitionId != leaderData.partitionId) {
         thread_info(cur)->thread_leader_data->leaderRouterId = leaderData.leaderRouterId;
         thread_info(cur)->thread_leader_data->partitionId = leaderData.partitionId;
-        thread_old_partition_data_purge(cur->thread_info);
+        thread_old_partition_data_purge(cur);
         accept_new_data = true;
     }
 
@@ -716,7 +716,7 @@ static void thread_host_child_update_request_process(protocol_interface_info_ent
     if (thread_info(cur)->thread_leader_data->partitionId != leaderData.partitionId) {
         thread_info(cur)->thread_leader_data->leaderRouterId = leaderData.leaderRouterId;
         thread_info(cur)->thread_leader_data->partitionId = leaderData.partitionId;
-        thread_old_partition_data_purge(cur->thread_info);
+        thread_old_partition_data_purge(cur);
     }
     //Check Network Data TLV
     if (mle_tlv_read_tlv(MLE_TYPE_NETWORK_DATA, mle_msg->data_ptr, mle_msg->data_length, &networkDataTlv)) {