From 8ca36cdf05e3ca0546b86ca25910752ded9d1d79 Mon Sep 17 00:00:00 2001
From: Olaf Bergmann <bergmann@tzi.org>
Date: Tue, 15 Aug 2023 12:52:25 +0200
Subject: [PATCH] coap_session.c: Fix GCC array bounds warning for memcpy

Copying from the multidimensional coap_layers_coap array into the
coap_layers of endpoint::sock.lfunc triggers a warning from
GCC v13.2.0 as the global variable has no space for the end marker
COAP_PROTO_LAST.

This change adds an assertion to indicate that proto is always less
than COAP_PROTO_LAST.
---
 src/coap_session.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/coap_session.c b/src/coap_session.c
index 69bd90fe..5cc3073d 100644
--- a/src/coap_session.c
+++ b/src/coap_session.c
@@ -1756,6 +1756,7 @@ coap_new_endpoint(coap_context_t *context, const coap_address_t *listen_addr, co
   ep->context = context;
   ep->proto = proto;
   ep->sock.endpoint = ep;
+  assert(proto < COAP_PROTO_LAST);
   memcpy(&ep->sock.lfunc, coap_layers_coap[proto], sizeof(ep->sock.lfunc));
 
   if (COAP_PROTO_NOT_RELIABLE(proto)) {