From 0d5f97f528f19c8375ee5d9b12decc471c7f009a Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Sat, 29 Sep 2012 19:18:13 +0000
Subject: [PATCH] -fixing #2569

---
 src/core/gnunet-service-core_clients.c    |  7 +++++--
 src/core/gnunet-service-core_neighbours.c | 20 ++++++++++++--------
 src/core/gnunet-service-core_sessions.c   |  9 ++++++---
 3 files changed, 23 insertions(+), 13 deletions(-)

diff --git a/src/core/gnunet-service-core_clients.c b/src/core/gnunet-service-core_clients.c
index 2f04ba57d..91f1ae65a 100644
--- a/src/core/gnunet-service-core_clients.c
+++ b/src/core/gnunet-service-core_clients.c
@@ -899,8 +899,11 @@ GSC_CLIENTS_done ()
     GNUNET_SERVER_notification_context_destroy (notifier);
     notifier = NULL;
   }
-  GNUNET_SERVER_mst_destroy (client_mst);
-  client_mst = NULL;
+  if (NULL != client_mst)
+  {
+    GNUNET_SERVER_mst_destroy (client_mst);
+    client_mst = NULL;
+  }
 }
 
 /* end of gnunet-service-core_clients.c */
diff --git a/src/core/gnunet-service-core_neighbours.c b/src/core/gnunet-service-core_neighbours.c
index ff0ca73f7..3b1357425 100644
--- a/src/core/gnunet-service-core_neighbours.c
+++ b/src/core/gnunet-service-core_neighbours.c
@@ -506,14 +506,18 @@ free_neighbour_helper (void *cls, const struct GNUNET_HashCode * key, void *valu
 void
 GSC_NEIGHBOURS_done ()
 {
-  if (NULL == transport)
-    return;
-  GNUNET_TRANSPORT_disconnect (transport);
-  transport = NULL;
-  GNUNET_CONTAINER_multihashmap_iterate (neighbours, &free_neighbour_helper,
-                                         NULL);
-  GNUNET_CONTAINER_multihashmap_destroy (neighbours);
-  neighbours = NULL;
+  if (NULL != transport)
+  {
+    GNUNET_TRANSPORT_disconnect (transport);
+    transport = NULL;
+  }
+  if (NULL != neighbours)
+  {
+    GNUNET_CONTAINER_multihashmap_iterate (neighbours, &free_neighbour_helper,
+					   NULL);
+    GNUNET_CONTAINER_multihashmap_destroy (neighbours);
+    neighbours = NULL;
+  }
 }
 
 /* end of gnunet-service-core_neighbours.c */
diff --git a/src/core/gnunet-service-core_sessions.c b/src/core/gnunet-service-core_sessions.c
index fa69134cb..87fa91189 100644
--- a/src/core/gnunet-service-core_sessions.c
+++ b/src/core/gnunet-service-core_sessions.c
@@ -810,9 +810,12 @@ free_session_helper (void *cls, const struct GNUNET_HashCode * key, void *value)
 void
 GSC_SESSIONS_done ()
 {
-  GNUNET_CONTAINER_multihashmap_iterate (sessions, &free_session_helper, NULL);
-  GNUNET_CONTAINER_multihashmap_destroy (sessions);
-  sessions = NULL;
+  if (NULL != sessions)
+  {
+    GNUNET_CONTAINER_multihashmap_iterate (sessions, &free_session_helper, NULL);
+    GNUNET_CONTAINER_multihashmap_destroy (sessions);
+    sessions = NULL;
+  }
 }
 
 /* end of gnunet-service-core_sessions.c */
-- 
2.25.1