[reactos] 01/01: [NTOS:EX] Only set WakeTimer-related status if timer handle is valid. CORE-18133

[Thomas Faber]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=7d1a497619f4001db59e5…

commit 7d1a497619f4001db59e552ddb69406bea4dae70
Author:     Thomas Faber <thomas.faber(a)reactos.org>
AuthorDate: Sun Apr 3 20:10:37 2022 -0400
Commit:     Thomas Faber <thomas.faber(a)reactos.org>
CommitDate: Sun Apr 3 20:13:09 2022 -0400

    [NTOS:EX] Only set WakeTimer-related status if timer handle is valid. CORE-18133
    
    Since STATUS_TIMER_RESUME_IGNORED is a success status, we would
    otherwise go into the success case with a NULL Timer object pointer.
---
 ntoskrnl/ex/timer.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/ntoskrnl/ex/timer.c b/ntoskrnl/ex/timer.c
index 0ce7af03156..0c33675333c 100644
--- a/ntoskrnl/ex/timer.c
+++ b/ntoskrnl/ex/timer.c
@@ -640,7 +640,10 @@ NtSetTimer(IN HANDLE TimerHandle,
      * functionality required to support them, make this check dependent
      * on the actual PM capabilities
      */
-    if (WakeTimer) Status = STATUS_TIMER_RESUME_IGNORED;
+    if (NT_SUCCESS(Status) && WakeTimer)
+    {
+        Status = STATUS_TIMER_RESUME_IGNORED;
+    }
 
     /* Check status */
     if (NT_SUCCESS(Status))