important check

1 files changed, 9 insertions, 0 deletions

diff --git a/src/transport/plugin_transport_udp.c b/src/transport/plugin_transport_udp.c
index 9c8c585de..925159a76 100644
--- a/src/transport/plugin_transport_udp.c
+++ b/src/transport/plugin_transport_udp.c
@@ -1562,6 +1562,15 @@ udp_plugin_get_session (void *cls,
 {
   struct Session * s = NULL;
 
+  if (NULL == address)
+  {
+        GNUNET_break (0);
+        return NULL;
+  }
+  if ((address->address_length != sizeof (struct IPv4UdpAddress)) &&
+                (address->address_length != sizeof (struct IPv6UdpAddress)))
+                return NULL;
+
   /* otherwise create new */
   if (NULL != (s = udp_plugin_lookup_session(cls, address)))
         return s;