From ea4bc3816f649175f2d2d3592dd2abd84735ac49 Mon Sep 17 00:00:00 2001
From: Adam Dunkels <adam@thingsquare.com>
Date: Fri, 22 Nov 2013 15:46:48 +0100
Subject: [PATCH] Produce an error if the UIP_TCP_MSS is too large for
 UIP_BUFSIZE

---
 core/net/uipopt.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/core/net/uipopt.h b/core/net/uipopt.h
index ce871985f..d0d3219ad 100644
--- a/core/net/uipopt.h
+++ b/core/net/uipopt.h
@@ -382,7 +382,10 @@
  * UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN.
  */
 #ifdef UIP_CONF_TCP_MSS
-#define UIP_TCP_MSS (UIP_CONF_TCP_MSS)
+#if UIP_CONF_TCP_MSS < (UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN)
+#error UIP_CONF_TCP_MSS is too large for the current UIP_BUFSIZE
+#endif /* UIP_CONF_TCP_MSS < (UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN) */
+#define UIP_TCP_MSS     (UIP_CONF_TCP_MSS)
 #else
 #define UIP_TCP_MSS     (UIP_BUFSIZE - UIP_LLH_LEN - UIP_TCPIP_HLEN)
 #endif