04/04: [NTOSKRNL] On open, verify and validate the hint device object if any

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=0b713d4fa0781ecce0367…

commit 0b713d4fa0781ecce03673ce9b3eb64d7a683382
Author:     Pierre Schweitzer <pierre(a)reactos.org>
AuthorDate: Fri Oct 5 10:49:11 2018 +0200
Commit:     Pierre Schweitzer <pierre(a)reactos.org>
CommitDate: Fri Oct 5 10:49:59 2018 +0200

    [NTOSKRNL] On open, verify and validate the hint device object if any
---
 ntoskrnl/io/iomgr/file.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/ntoskrnl/io/iomgr/file.c b/ntoskrnl/io/iomgr/file.c
index c14e61806b..d8bb852606 100644
--- a/ntoskrnl/io/iomgr/file.c
+++ b/ntoskrnl/io/iomgr/file.c
@@ -673,10 +673,16 @@ IopParseDevice(IN PVOID ParseObject,
             }
         }
 
+        /* If we have a top level device hint, verify it */
         if (OpenPacket->InternalFlags & IOP_USE_TOP_LEVEL_DEVICE_HINT)
         {
-            // FIXME: Verify our device object is good to use
-            ASSERT(DirectOpen == FALSE);
+            Status = IopCheckTopDeviceHint(&DeviceObject, OpenPacket, DirectOpen);
+            if (!NT_SUCCESS(Status))
+            {
+                IopDereferenceDeviceObject(OriginalDeviceObject, FALSE);
+                if (Vpb) IopDereferenceVpbAndFree(Vpb);
+                return Status;
+            }
         }
 
         /* If we traversed a mount point, reset the information */