From feb0f56da7a4375b075227871e7afa3d96b2f033 Mon Sep 17 00:00:00 2001
From: Timo Kreuzer <timo.kreuzer@reactos.org>
Date: Mon, 28 Jul 2025 16:32:33 +0300
Subject: [PATCH] [NTOS:EX] Fix query of SystemInterruptInformation

---
 ntoskrnl/ex/sysinfo.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/ntoskrnl/ex/sysinfo.c b/ntoskrnl/ex/sysinfo.c
index 4fa411f6d9c..a2f3e84007a 100644
--- a/ntoskrnl/ex/sysinfo.c
+++ b/ntoskrnl/ex/sysinfo.c
@@ -1561,7 +1561,8 @@ QSI_DEF(SystemInterruptInformation)
     ULONG ti;
     PSYSTEM_INTERRUPT_INFORMATION sii = (PSYSTEM_INTERRUPT_INFORMATION)Buffer;
 
-    if(Size < KeNumberProcessors * sizeof(SYSTEM_INTERRUPT_INFORMATION))
+    *ReqSize = KeNumberProcessors * sizeof(SYSTEM_INTERRUPT_INFORMATION);
+    if (Size < *ReqSize)
     {
         return STATUS_INFO_LENGTH_MISMATCH;
     }
@@ -1572,7 +1573,7 @@ QSI_DEF(SystemInterruptInformation)
     {
         Prcb = KiProcessorBlock[i];
         sii->ContextSwitches = KeGetContextSwitches(Prcb);
-        sii->DpcCount = Prcb->DpcData[0].DpcCount;
+        sii->DpcCount = Prcb->DpcData[DPC_NORMAL].DpcCount;
         sii->DpcRate = Prcb->DpcRequestRate;
         sii->TimeIncrement = ti;
         sii->DpcBypassCount = 0;