[pschweitzer] 65042: [FASTFAT] Add sanity checks in VfatSetRenameInformation() to make sure we don't leak any FCB reference

Author: pschweitzer
Date: Mon Oct 27 13:38:14 2014
New Revision: 65042

URL: http://svn.reactos.org/svn/reactos?rev=65042&view=rev
Log:
[FASTFAT]
Add sanity checks in VfatSetRenameInformation() to make sure we don't leak any FCB reference

Modified:
    trunk/reactos/drivers/filesystems/fastfat/finfo.c

Modified: trunk/reactos/drivers/filesystems/fastfat/finfo.c
URL: http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfat...
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/finfo.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/finfo.c	[iso-8859-1] Mon Oct 27 13:38:14 2014
@@ -473,6 +473,8 @@
     OBJECT_ATTRIBUTES ObjectAttributes;
     HANDLE TargetHandle;
     BOOLEAN DeletedTarget;
+    ULONG OldReferences, NewReferences;
+    PVFATFCB OldParent;

DPRINT("VfatSetRenameInfo(%p, %p, %p, %p, %p)\n", FileObject, FCB, DeviceExt, RenameInfo, TargetFileObject);

@@ -481,6 +483,8 @@
     {
         return STATUS_INVALID_PARAMETER;
     }
+
+    OldReferences = FCB->parentFcb->RefCount;

/* If we are performing relative opening for rename, get FO for getting FCB and path name */
     if (RenameInfo->RootDirectory != NULL)
@@ -686,6 +690,7 @@
         if (FsRtlAreNamesEqual(&SourceFile, &NewFile, FALSE, NULL))
         {
             Status = STATUS_SUCCESS;
+            ASSERT(OldReferences == FCB->parentFcb->RefCount);
             goto Cleanup;
         }

@@ -729,6 +734,8 @@
                                                 &DeletedTarget);
             if (!NT_SUCCESS(Status))
             {
+                ASSERT(OldReferences == FCB->parentFcb->RefCount - 1);
+                ASSERT(OldReferences == ParentFCB->RefCount - 1);
                 goto Cleanup;
             }

@@ -773,11 +780,16 @@
                 }
             }
         }
+
+        ASSERT(OldReferences == FCB->parentFcb->RefCount - 1); // extra grab
+        ASSERT(OldReferences == ParentFCB->RefCount - 1); // extra grab
     }
     else
     {
+
         /* Try to find target */
         ParentFCB = NULL;
+        OldParent = FCB->parentFcb;
         Status = vfatPrepareTargetForRename(DeviceExt,
                                             &ParentFCB,
                                             &NewName,
@@ -786,8 +798,11 @@
                                             &DeletedTarget);
         if (!NT_SUCCESS(Status))
         {
+            ASSERT(OldReferences == FCB->parentFcb->RefCount);
             goto Cleanup;
         }
+
+        NewReferences = ParentFCB->RefCount;

FsRtlNotifyFullReportChange(DeviceExt->NotifySync,
                                     &(DeviceExt->NotifyList),
@@ -831,6 +846,8 @@
         }
     }

+    ASSERT(OldReferences == OldParent->RefCount + 1); // removed file
+    ASSERT(NewReferences == ParentFCB->RefCount - 1); // new file
 Cleanup:
     if (ParentFCB != NULL) vfatReleaseFCB(DeviceExt, ParentFCB);
     if (NewName.Buffer != NULL) ExFreePoolWithTag(NewName.Buffer, TAG_VFAT);