From 51e9f26b1014d6f935cacad7da75d98234653482 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Tue, 11 Apr 2017 11:37:46 +0200
Subject: fix #4985

---
 src/conversation/gnunet-service-conversation.c | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/conversation/gnunet-service-conversation.c')

diff --git a/src/conversation/gnunet-service-conversation.c b/src/conversation/gnunet-service-conversation.c
index 5f43bfe80..7d319e51e 100644
--- a/src/conversation/gnunet-service-conversation.c
+++ b/src/conversation/gnunet-service-conversation.c
@@ -1270,6 +1270,14 @@ handle_client_register_message (void *cls,
                                        NULL,
                                        &inbound_end,
                                        cadet_handlers);
+  if (NULL == line->port)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                _("Could not open line, port %s already in use!\n"),
+                GNUNET_h2s (&msg->line_port));
+    GNUNET_SERVICE_client_drop (line->client);
+    return;
+  }
   GNUNET_SERVICE_client_continue (line->client);
 }
 
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