[FASTFAT] Avoid a use after free in VfatCloseFile.

[reactos.git] / drivers / filesystems / fastfat / close.c

diff --git a/drivers/filesystems/fastfat/close.c b/drivers/filesystems/fastfat/close.c
index b6c250f..57efdad 100644 (file)
--- a/drivers/filesystems/fastfat/close.c
+++ b/drivers/filesystems/fastfat/close.c
@@ -163,6 +163,7 @@ VfatCloseFile(
 {
     PVFATFCB pFcb;
     PVFATCCB pCcb;
+    BOOLEAN IsVolume;
     NTSTATUS Status = STATUS_SUCCESS;
 
     DPRINT("VfatCloseFile(DeviceExt %p, FileObject %p)\n",
@@ -177,6 +178,8 @@ VfatCloseFile(
         return STATUS_SUCCESS;
     }
 
+    IsVolume = BooleanFlagOn(pFcb->Flags, FCB_IS_VOLUME);
+
     if (pCcb)
     {
         vfatDestroyCCB(pCcb);
@@ -194,7 +197,7 @@ VfatCloseFile(
     FileObject->SectionObjectPointer = NULL;
 
 #ifdef ENABLE_SWAPOUT
-    if (BooleanFlagOn(pFcb->Flags, FCB_IS_VOLUME) && DeviceExt->OpenHandleCount == 0)
+    if (IsVolume && DeviceExt->OpenHandleCount == 0)
     {
         VfatCheckForDismount(DeviceExt, FALSE);
     }