From 2ce3fe43765aa23863954bf9667dc896c7205531 Mon Sep 17 00:00:00 2001
From: Christian Grothoff <christian@grothoff.org>
Date: Wed, 21 Jul 2010 08:05:57 +0000
Subject: [PATCH] check and handle

---
 src/util/server_mst.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/util/server_mst.c b/src/util/server_mst.c
index 0856ba576..835d8eeba 100644
--- a/src/util/server_mst.c
+++ b/src/util/server_mst.c
@@ -251,6 +251,12 @@ GNUNET_SERVER_mst_receive (struct GNUNET_SERVER_MessageStreamTokenizer *mst,
 	  /* can try to do zero-copy and process directly from original buffer */
 	  hdr = (const struct GNUNET_MessageHeader *) buf;
 	  want = ntohs (hdr->size);
+	  if (want < sizeof (struct GNUNET_MessageHeader))
+	    {
+	      GNUNET_break_op (0);
+	      mst->off = 0;
+	      return GNUNET_SYSERR;
+	    }
 	  if (size < want)
 	    break; /* or not, buffer incomplete, so copy to private buffer... */
 	  if (one_shot == GNUNET_SYSERR)
-- 
2.25.1