[tfaber] 65270: [FASTFAT] - Assert that we never reference or dereference an FCB with RefCount 0 CORE-8733

Author: tfaber
Date: Wed Nov  5 19:06:19 2014
New Revision: 65270

URL: http://svn.reactos.org/svn/reactos?rev=65270&view=rev
Log:
[FASTFAT]
- Assert that we never reference or dereference an FCB with RefCount 0
CORE-8733

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

Modified: trunk/reactos/drivers/filesystems/fastfat/fcb.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat/fcb.c	[iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat/fcb.c	[iso-8859-1] Wed Nov  5 19:06:19 2014
@@ -295,6 +295,7 @@
     ASSERT(ExIsResourceAcquiredExclusive(&pVCB->DirResource));
 
     ASSERT(pFCB != pVCB->VolumeFcb);
+    ASSERT(pFCB->RefCount > 0);
     ++pFCB->RefCount;
 }
 
@@ -313,6 +314,7 @@
     while (pFCB)
     {
         ASSERT(pFCB != pVCB->VolumeFcb);
+        ASSERT(pFCB->RefCount > 0);
         pFCB->RefCount--;
         if (pFCB->RefCount == 0)
         {
@@ -497,7 +499,6 @@
     fileObject->FsContext = fcb;
     fileObject->FsContext2 = newCCB;
     fcb->FileObject = fileObject;
-    vfatGrabFCB(vcb, fcb);
 
     _SEH2_TRY
     {
@@ -510,7 +511,6 @@
     _SEH2_EXCEPT(EXCEPTION_EXECUTE_HANDLER)
     {
         status = _SEH2_GetExceptionCode();
-        fcb->RefCount--;
         fcb->FileObject = NULL;
         ExFreeToNPagedLookasideList(&VfatGlobalData->CcbLookasideList, newCCB);
         ObDereferenceObject(fileObject);
@@ -518,6 +518,7 @@
     }
     _SEH2_END;
 
+    vfatGrabFCB(vcb, fcb);
     fcb->Flags |= FCB_CACHE_INITIALIZED;
     return STATUS_SUCCESS;
 }
@@ -663,7 +664,7 @@
     rcFCB->RFCB.FileSize.QuadPart = Size;
     rcFCB->RFCB.ValidDataLength.QuadPart = Size;
     rcFCB->RFCB.AllocationSize.QuadPart = ROUND_UP(Size,
vcb->FatInfo.BytesPerCluster);
-    vfatGrabFCB(vcb, rcFCB);
+    rcFCB->RefCount = 1;
     if (vfatFCBIsDirectory(rcFCB))
     {
         vfatFCBInitializeCacheFromVolume(vcb, rcFCB);