[PATCH 4/5] Implement PsLookupThreadByThreadId.

[Derek Lesho]

Signed-off-by: Derek Lesho 
---
 dlls/ntoskrnl.exe/ntoskrnl.c        | 20 ++++++++++++++++++++
 dlls/ntoskrnl.exe/ntoskrnl.exe.spec |  2 +-
 2 files changed, 21 insertions(+), 1 deletion(-)

diff --git a/dlls/ntoskrnl.exe/ntoskrnl.c b/dlls/ntoskrnl.exe/ntoskrnl.c
index 335918f99f..85235a444d 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.c
+++ b/dlls/ntoskrnl.exe/ntoskrnl.c
@@ -3262,6 +3262,26 @@ NTSTATUS WINAPI PsLookupProcessByProcessId(HANDLE processid, PEPROCESS *process)
 }

+/*****************************************************
+ *           PsLookupThreadByThreadId   (NTOSKRNL.EXE.@)
+ */
+NTSTATUS WINAPI PsLookupThreadByThreadId(HANDLE threadid, PETHREAD *thread)
+{
+    NTSTATUS status;
+    HANDLE hThread = OpenThread( THREAD_ALL_ACCESS, FALSE, HandleToUlong(threadid) );
+
+    if (!hThread)
+        return STATUS_INVALID_PARAMETER;
+
+    status = kernel_object_from_handle( hThread, PsThreadType, (void**)thread );
+
+    ObReferenceObject( *thread );
+
+    NtClose( hThread );
+    return status;
+}
+
+
 /*****************************************************
  *           IoSetThreadHardErrorMode  (NTOSKRNL.EXE.@)
  */
diff --git a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
index 0e9e6a7630..f8d73450de 100644
--- a/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
+++ b/dlls/ntoskrnl.exe/ntoskrnl.exe.spec
@@ -913,7 +913,7 @@
 @ stub PsJobType
 @ stdcall PsLookupProcessByProcessId(ptr ptr)
 @ stub PsLookupProcessThreadByCid
-@ stub PsLookupThreadByThreadId
+@ stdcall PsLookupThreadByThreadId(ptr ptr)
 @ extern PsProcessType
 @ stub PsReferenceImpersonationToken
 @ stub PsReferencePrimaryToken