1 files changed, 7 insertions, 0 deletions

diff --git a/src/scalarproduct/gnunet-service-scalarproduct_alice.c b/src/scalarproduct/gnunet-service-scalarproduct_alice.c
index e75915f9a..3bfb4ffe0 100644
--- a/src/scalarproduct/gnunet-service-scalarproduct_alice.c
+++ b/src/scalarproduct/gnunet-service-scalarproduct_alice.c
@@ -731,6 +731,13 @@ handle_bobs_cryptodata_message (void *cls,
     return GNUNET_SYSERR;
   }
   msg = (const struct ServiceResponseMessage *) message;
+  GNUNET_break_op (0 == ntohl (msg->reserved));
+  if (s->used_element_count != ntohl (msg->intersection_element_count))
+  {
+    /* Alice and Bob disagree on intersection set size, bad news! */
+    GNUNET_break_op (0);
+    return GNUNET_SYSERR;
+  }
   contained = ntohl (msg->contained_element_count);
   required_size = sizeof (struct ServiceResponseMessage)
     + 2 * contained * sizeof (struct GNUNET_CRYPTO_PaillierCiphertext)