From 27775bd0773afa0ec07c99e34b4b7eab54f76fa7 Mon Sep 17 00:00:00 2001
From: "Wiedner, Daniel" <daniel.wiedner@netatwork.de>
Date: Wed, 24 Oct 2018 15:20:08 +0200
Subject: [PATCH] Added cyclic sector chain check to
 CompoundFile.GetMiniSectorChain

---
 sources/OpenMcdf/CompoundFile.cs | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sources/OpenMcdf/CompoundFile.cs b/sources/OpenMcdf/CompoundFile.cs
index 556ea88e..d0654175 100644
--- a/sources/OpenMcdf/CompoundFile.cs
+++ b/sources/OpenMcdf/CompoundFile.cs
@@ -1507,8 +1507,13 @@ StreamView miniFATView
                     result.Add(ms);
 
                     miniFATView.Seek(nextSecID * 4, SeekOrigin.Begin);
-                    nextSecID = miniFATReader.ReadInt32();
-                }
+					int next = miniFATReader.ReadInt32();
+
+					if (next != nextSecID)
+						nextSecID = next;
+					else
+						throw new CFCorruptedFileException("Cyclic sector chain found. File is corrupted");
+				}
             }
             return result;
         }