https://git.reactos.org/?p=reactos.git;a=commitdiff;h=161b6728ef4522a069e2a6375fc2d1a39b683aa5
commit 161b6728ef4522a069e2a6375fc2d1a39b683aa5 Author: Pierre Schweitzer <[email protected]> AuthorDate: Fri Oct 5 10:36:52 2018 +0200 Commit: Pierre Schweitzer <[email protected]> CommitDate: Fri Oct 5 10:49:59 2018 +0200 [NTOSKRNL] Implement IopVerifyDeviceObjectOnStack() --- ntoskrnl/io/iomgr/device.c | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/ntoskrnl/io/iomgr/device.c b/ntoskrnl/io/iomgr/device.c index 04f7d5d2db..189e47b71b 100644 --- a/ntoskrnl/io/iomgr/device.c +++ b/ntoskrnl/io/iomgr/device.c @@ -687,6 +687,40 @@ IopGetRelatedTargetDevice(IN PFILE_OBJECT FileObject, return Status; } +BOOLEAN +NTAPI +IopVerifyDeviceObjectOnStack(IN PDEVICE_OBJECT BaseDeviceObject, + IN PDEVICE_OBJECT TopDeviceObjectHint) +{ + KIRQL OldIrql; + BOOLEAN Result; + PDEVICE_OBJECT LoopObject; + + ASSERT(BaseDeviceObject != NULL); + + Result = FALSE; + /* Simply loop on the device stack and try to find our hint */ + OldIrql = KeAcquireQueuedSpinLock(LockQueueIoDatabaseLock); + for (LoopObject = BaseDeviceObject; ; LoopObject = LoopObject->AttachedDevice) + { + /* It was found, it's a success */ + if (LoopObject == TopDeviceObjectHint) + { + Result = TRUE; + break; + } + + /* End of the stack, that's a failure - default */ + if (LoopObject == NULL) + { + break; + } + } + KeReleaseQueuedSpinLock(LockQueueIoDatabaseLock, OldIrql); + + return Result; +} + /* PUBLIC FUNCTIONS ***********************************************************/ /*
