[reactos] 10/13: [NTOS:IO] In IopSynchronousCall first check IrpStack->MajorFunction before checking minor

[Timo Kreuzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=98a8e8f862251844fa39fa...

commit 98a8e8f862251844fa39faa57822485feaf9d937
Author:     Timo Kreuzer [e-mail]
AuthorDate: Sun Jun 2 09:45:45 2019 +0200
Commit:     Timo Kreuzer [e-mail]
CommitDate: Thu Aug 15 18:04:57 2019 +0200

[NTOS:IO] In IopSynchronousCall first check IrpStack->MajorFunction before checking minor

Minor function indices are not unique, they are subfunctions, so without first checking the major function, they are ambiguous.
---
 ntoskrnl/io/pnpmgr/pnpmgr.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/ntoskrnl/io/pnpmgr/pnpmgr.c b/ntoskrnl/io/pnpmgr/pnpmgr.c
index e5530c61714..f2048782af0 100644
--- a/ntoskrnl/io/pnpmgr/pnpmgr.c
+++ b/ntoskrnl/io/pnpmgr/pnpmgr.c
@@ -1441,7 +1441,8 @@ IopSynchronousCall(IN PDEVICE_OBJECT DeviceObject,
     Irp->IoStatus.Information = IoStatusBlock.Information = 0;

/* Special case for IRP_MN_FILTER_RESOURCE_REQUIREMENTS */
-    if (IoStackLocation->MinorFunction == IRP_MN_FILTER_RESOURCE_REQUIREMENTS)
+    if ((IoStackLocation->MajorFunction == IRP_MJ_PNP) &&
+        (IoStackLocation->MinorFunction == IRP_MN_FILTER_RESOURCE_REQUIREMENTS))
     {
         /* Copy the resource requirements list into the IOSB */
         Irp->IoStatus.Information =