From bef9bd6e6954e7f935ab6639d2ef6647695c2ef9 Mon Sep 17 00:00:00 2001
From: Tal Aloni <tal.aloni.il@gmail.com>
Date: Tue, 7 Feb 2017 14:11:44 +0200
Subject: [PATCH] FileTimeHelper.ReadNullableFileTime: throw
 InvalidDataException if FILETIME is negative

---
 SMBLibrary/Helpers/FileTimeHelper.cs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/SMBLibrary/Helpers/FileTimeHelper.cs b/SMBLibrary/Helpers/FileTimeHelper.cs
index 85489cc..20e88b1 100644
--- a/SMBLibrary/Helpers/FileTimeHelper.cs
+++ b/SMBLibrary/Helpers/FileTimeHelper.cs
@@ -52,10 +52,14 @@ namespace SMBLibrary
             {
                 return DateTime.FromFileTimeUtc(span);
             }
-            else
+            else if (span == 0)
             {
                 return null;
             }
+            else
+            {
+                throw new System.IO.InvalidDataException("FILETIME cannot be negative");
+            }
         }
 
         public static DateTime? ReadNullableFileTime(byte[] buffer, ref int offset)