[reactos] 01/03: [NTOSKRNL] On session last reference removal, dereference LUID device map

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=5ecc05003d2a7cfda9f6af...

commit 5ecc05003d2a7cfda9f6aff299188b39c92ef273
Author:     Pierre Schweitzer [e-mail]
AuthorDate: Mon Jun 10 12:30:49 2019 +0200
Commit:     Pierre Schweitzer [e-mail]
CommitDate: Mon Jun 10 12:30:49 2019 +0200

[NTOSKRNL] On session last reference removal, dereference LUID device map
---
 ntoskrnl/se/srm.c | 28 ++++++++++++++++++++++++++--
 1 file changed, 26 insertions(+), 2 deletions(-)

diff --git a/ntoskrnl/se/srm.c b/ntoskrnl/se/srm.c
index f0cc7341093..9134ebadb5d 100644
--- a/ntoskrnl/se/srm.c
+++ b/ntoskrnl/se/srm.c
@@ -392,7 +392,7 @@ SepRmReferenceLogonSession(
         if (RtlEqualLuid(&CurrentSession->LogonId, LogonLuid))
         {
             /* Reference the session */
-            CurrentSession->ReferenceCount += 1;
+            ++CurrentSession->ReferenceCount;
             DPRINT("ReferenceCount: %lu\n", CurrentSession->ReferenceCount);

/* Release the database lock */
@@ -409,10 +409,21 @@ SepRmReferenceLogonSession(
 }

+NTSTATUS
+SepCleanupLUIDDeviceMapDirectory(
+    PLUID LogonLuid)
+{
+    UNIMPLEMENTED;
+    return STATUS_NOT_IMPLEMENTED;
+}
+
+
 NTSTATUS
 SepRmDereferenceLogonSession(
     PLUID LogonLuid)
 {
+    ULONG RefCount;
+    PDEVICE_MAP DeviceMap;
     PSEP_LOGON_SESSION_REFERENCES CurrentSession;

DPRINT("SepRmDereferenceLogonSession(%08lx:%08lx)\n",
@@ -430,12 +441,25 @@ SepRmDereferenceLogonSession(
         if (RtlEqualLuid(&CurrentSession->LogonId, LogonLuid))
         {
             /* Dereference the session */
-            CurrentSession->ReferenceCount -= 1;
+            RefCount = --CurrentSession->ReferenceCount;
             DPRINT("ReferenceCount: %lu\n", CurrentSession->ReferenceCount);

/* Release the database lock */
             KeReleaseGuardedMutex(&SepRmDbLock);

+            /* We're done with the session */
+            if (RefCount == 0)
+            {
+                /* Get rid of the LUID device map */
+                DeviceMap = CurrentSession->pDeviceMap;
+                if (DeviceMap != NULL)
+                {
+                    CurrentSession->pDeviceMap = NULL;
+                    SepCleanupLUIDDeviceMapDirectory(LogonLuid);
+                    ObfDereferenceDeviceMap(DeviceMap);
+                }
+            }
+
             return STATUS_SUCCESS;
         }
     }