diff --git a/src/iot_dump_log.c b/src/iot_dump_log.c
index fdf74240..2ca72b9b 100644
--- a/src/iot_dump_log.c
+++ b/src/iot_dump_log.c
@@ -206,6 +206,10 @@ int st_create_log_dump(IOT_CTX *iot_ctx, char **log_dump_output, size_t max_log_
 #else
 #error "Need to choice STDK_IOT_CORE_LOG_FILE_TYPE first"
 #endif
+    if (!logfile) {
+        IOT_ERROR("fail to open log file");
+        return IOT_ERROR_BAD_REQ;
+    }
 #endif
 
     if (need_base64) {
diff --git a/stdkconfig.cmake b/stdkconfig.cmake
index 00aac1f8..df941913 100644
--- a/stdkconfig.cmake
+++ b/stdkconfig.cmake
@@ -23,9 +23,11 @@ SET(STDK_UNITTEST_EXTRA_CFLAGS
     CONFIG_STDK_IOT_CORE_SECURITY_BACKEND_SOFTWARE
     #CONFIG_STDK_IOT_CORE_EASYSETUP_POSIX_TESTING
     CONFIG_STDK_IOT_CORE_CRYPTO_SUPPORT_VERIFY
-
+    CONFIG_STDK_IOT_CORE_LOG_FILE
+    CONFIG_STDK_IOT_CORE_LOG_FILE_RAM_ONLY
+    CONFIG_STDK_IOT_CORE_LOG_FILE_RAM_BUF_SIZE=8192
     #CONFIG_STDK_IOT_CORE_LOG_LEVEL_ERROR
     #CONFIG_STDK_IOT_CORE_LOG_LEVEL_WARN
     #CONFIG_STDK_IOT_CORE_LOG_LEVEL_INFO
     #CONFIG_STDK_IOT_CORE_LOG_LEVEL_DEBUG
-    )
\ No newline at end of file
+    )
diff --git a/test/TC_FUNC_iot_dump_log.c b/test/TC_FUNC_iot_dump_log.c
index 4851a47c..1ac74256 100644
--- a/test/TC_FUNC_iot_dump_log.c
+++ b/test/TC_FUNC_iot_dump_log.c
@@ -47,6 +47,11 @@ void TC_iot_dump_create_dump_state_failure(void **state)
     size_t max_log_dump_size = 0;
     int mode = 0;
     iot_error_t err;
+#ifdef CONFIG_STDK_IOT_CORE_LOG_FILE
+    int malloc_test_count = 4;
+#else
+    int malloc_test_count = 3;
+#endif
 
     // Given :  max_log_dump_size is smaller than minimum
     max_log_dump_size = 1;
@@ -57,7 +62,7 @@ void TC_iot_dump_create_dump_state_failure(void **state)
 
     mode = IOT_DUMP_MODE_NEED_BASE64 | IOT_DUMP_MODE_NEED_DUMP_STATE;
     max_log_dump_size = 500;
-    for (int i = 0; i < 3; i++) {
+    for (int i = 0; i < malloc_test_count; i++) {
         // Given: malloc failure
         do_not_use_mock_iot_os_malloc_failure();
         set_mock_iot_os_malloc_failure_with_index(i);