From b637046c9d155d832fcab1892bc2999ffe1ad8a8 Mon Sep 17 00:00:00 2001
From: Eric Kohl <eric.kohl@reactos.org>
Date: Wed, 11 Dec 2013 11:42:44 +0000
Subject: [PATCH] [FASTFAT] Fail, if we try to overwrite an eixting read-only
 file.

svn path=/trunk/; revision=61260
---
 reactos/drivers/filesystems/fastfat/create.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/reactos/drivers/filesystems/fastfat/create.c b/reactos/drivers/filesystems/fastfat/create.c
index 70924a5882e..04d0c0d3452 100644
--- a/reactos/drivers/filesystems/fastfat/create.c
+++ b/reactos/drivers/filesystems/fastfat/create.c
@@ -349,6 +349,7 @@ VfatOpenFile(
     PDEVICE_EXTENSION DeviceExt,
     PUNICODE_STRING PathNameU,
     PFILE_OBJECT FileObject,
+    ULONG RequestedDisposition,
     PVFATFCB *ParentFcb)
 {
     PVFATFCB Fcb;
@@ -404,6 +405,15 @@ VfatOpenFile(
         vfatReleaseFCB (DeviceExt, Fcb);
         return STATUS_DELETE_PENDING;
     }
+
+    /* Fail, if we try to overwrite a read-only file */
+    if ((*Fcb->Attributes & FILE_ATTRIBUTE_READONLY) &&
+        (RequestedDisposition == FILE_OVERWRITE))
+    {
+        vfatReleaseFCB(DeviceExt, Fcb);
+        return STATUS_ACCESS_DENIED;
+    }
+
     DPRINT("Attaching FCB to fileObject\n");
     Status = vfatAttachFCBToFileObject(DeviceExt, Fcb, FileObject);
     if (!NT_SUCCESS(Status))
@@ -519,7 +529,7 @@ VfatCreateFile(
     }
 
     /* Try opening the file. */
-    Status = VfatOpenFile(DeviceExt, &PathNameU, FileObject, &ParentFcb);
+    Status = VfatOpenFile(DeviceExt, &PathNameU, FileObject, RequestedDisposition, &ParentFcb);
 
     /*
      * If the directory containing the file to open doesn't exist then