From 8ef8a564015e22c21ee1940b35d8f858add69d5e Mon Sep 17 00:00:00 2001
From: Jon Shallow <supjps-libcoap@jpshallow.com>
Date: Wed, 4 Mar 2026 17:13:08 +0000
Subject: [PATCH] OSS-FUZZ: Fix build issue

---
 tests/oss-fuzz/block_target.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tests/oss-fuzz/block_target.c b/tests/oss-fuzz/block_target.c
index 42c4cb577a..412e080b73 100644
--- a/tests/oss-fuzz/block_target.c
+++ b/tests/oss-fuzz/block_target.c
@@ -7,6 +7,9 @@ LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   coap_pdu_t *pdu = NULL;
   coap_address_t addr;
 
+  if (size <= 4)
+    return 0;
+
   coap_startup();
   coap_set_log_level(COAP_LOG_EMERG);