Fix fuzzy test case libspdm_test_responder_chunk_send_ack_case1

Signed-off-by: Xiaohanjlll <[email protected]>

unit_test/fuzzing/test_responder/test_spdm_responder_chunk_send_ack/chunk_send_ack.c

@@ -1,6 +1,6 @@
 /**
  *  Copyright Notice:
- *  Copyright 2021-2022 DMTF. All rights reserved.
+ *  Copyright 2021-2024 DMTF. All rights reserved.
  *  License: BSD 3-Clause License. For full text see link: https://github.com/DMTF/libspdm/blob/main/LICENSE.md
  **/
 
@@ -89,7 +89,13 @@ void libspdm_test_responder_chunk_send_ack_case1(void **State)
 
     do
     {
-        if (chunk_num == 0) {
+      if (chunk_num == 0) {
+            /* (uint32_t)LargeMessageSize This field shall only be present when ChunkSeqNo 
+             * is zero and shall have a non-zero value.
+             * The bytes_total should not be less than the minimum effective size.*/
+            if(bytes_total < sizeof(spdm_chunk_send_request_t) + sizeof(uint32_t)) {
+                break;
+            }
             chunk_send_request = (spdm_chunk_send_request_t *)request;
             spdm_message_header_t *test_spdm_message_header_t;
 
@@ -155,7 +161,8 @@ void libspdm_test_responder_chunk_send_ack_case1(void **State)
         if (status != LIBSPDM_STATUS_SUCCESS) {
             break;
         }
-    } while (bytes_sent < bytes_total);
+    /* The remaining number of bytes should not be less than the minimum effective size*/
+    } while (bytes_sent < (bytes_total - sizeof(spdm_chunk_send_request_t)));
 }
 
 libspdm_test_context_t m_libspdm_responder_chunk_send_ack_test_context = {