block size of 0 is also valid

diff --git a/src/dht/plugin_block_dht.c b/src/dht/plugin_block_dht.c
index 4256a0fe64464bcd0bb0d7fb286d564558469527..8bb53396166a36db6a0aebe770f1e91c282e757e 100644 (file)
--- a/src/dht/plugin_block_dht.c
+++ b/src/dht/plugin_block_dht.c
@@ -75,7 +75,8 @@ block_plugin_dht_evaluate (void *cls,
     GNUNET_break_op (0);
     return GNUNET_BLOCK_EVALUATION_REQUEST_INVALID;
   }
-  if (NULL == reply_block)
+  if ( (NULL == reply_block) ||
+       (0 == reply_block_size) )
     return GNUNET_BLOCK_EVALUATION_REQUEST_VALID;
   if (reply_block_size < sizeof (struct GNUNET_MessageHeader))
   {