From 5dc2dfca86ec1cd754327dfd9a8c50b1ef380882 Mon Sep 17 00:00:00 2001
From: Jon Shallow <supjps-libcoap@jpshallow.com>
Date: Mon, 20 Dec 2021 20:31:37 +0000
Subject: [PATCH] block.c: Do not match large response if no Block2 option in
 request

Allows a following request not to match cached multi-payload large response.
---
 src/block.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/block.c b/src/block.c
index 0563fbfe..a8723843 100644
--- a/src/block.c
+++ b/src/block.c
@@ -992,9 +992,9 @@ coap_handle_request_send_block(coap_session_t *session,
   uint32_t out_blocks[1];
   const char *error_phrase;
 
-  if (coap_get_block(pdu, COAP_OPTION_BLOCK2, &block)) {
-    block_opt = COAP_OPTION_BLOCK2;
-  }
+  if (!coap_get_block(pdu, COAP_OPTION_BLOCK2, &block))
+    return 0;
+  block_opt = COAP_OPTION_BLOCK2;
   LL_FOREACH(session->lg_xmit, p) {
     size_t chunk;
     coap_opt_iterator_t opt_iter;