guard against 0

1 files changed, 2 insertions, 1 deletions

diff --git a/src/cadet/gnunet-service-cadet-new.c b/src/cadet/gnunet-service-cadet-new.c
index 78d4206f0..76bc4ec48 100644
--- a/src/cadet/gnunet-service-cadet-new.c
+++ b/src/cadet/gnunet-service-cadet-new.c
@@ -644,7 +644,8 @@ check_data (void *cls,
                    buf,
                    sizeof (pa));
     payload_claimed_size = ntohs (pa.size);
-    if (payload_size < payload_claimed_size)
+    if ( (payload_size < payload_claimed_size) ||
+         (0 == payload_claimed_size) )
     {
       GNUNET_break_op (0);
       return GNUNET_SYSERR;