From 6c656612a256113ac08cb0433d8f799d02b2a105 Mon Sep 17 00:00:00 2001
From: Michael Zillgith <michael.zillgith@mz-automation.de>
Date: Mon, 25 Nov 2019 18:14:13 +0100
Subject: [PATCH] MMS server: handle file close with unknown FRSM ID

---
 src/mms/iso_mms/server/mms_file_service.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/src/mms/iso_mms/server/mms_file_service.c b/src/mms/iso_mms/server/mms_file_service.c
index 86ceb25f..6a67f44e 100644
--- a/src/mms/iso_mms/server/mms_file_service.c
+++ b/src/mms/iso_mms/server/mms_file_service.c
@@ -857,11 +857,19 @@ mmsServer_handleFileCloseRequest(
 
     MmsFileReadStateMachine* frsm = getFrsm(connection, frsmId);
 
-    FileSystem_closeFile(frsm->fileHandle);
-    frsm->fileHandle = NULL;
-    frsm->frsmId = 0;
+    if (frsm) {
+        FileSystem_closeFile(frsm->fileHandle);
+        frsm->fileHandle = NULL;
+        frsm->frsmId = 0;
 
-    mmsMsg_createFileCloseResponse(invokeId, response);
+        mmsMsg_createFileCloseResponse(invokeId, response);
+    }
+    else {
+        if (DEBUG_MMS_SERVER)
+            printf("MMS_SERVER: Unused file ID %i\n", frsmId);
+
+        mmsMsg_createServiceErrorPdu(invokeId, response, MMS_ERROR_FILE_OTHER);
+    }
 }