Hesham/wintun
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Remove TunMapIrp

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2019-07-05 14:41:54 +00:00
parent 17a0e2647a
commit fb738767a0
1 changed files with 8 additions and 28 deletions
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36
wintun.c
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@ -346,32 +346,6 @@ TunUnmapUbuffer(_Inout_ TUN_MAPPED_UBUFFER *MappedBuffer)
}
}
_IRQL_requires_max_(APC_LEVEL)
_Must_inspect_result_
static NTSTATUS
TunMapIrp(_In_ IRP *Irp)
{
ULONG Size;
TUN_MAPPED_UBUFFER *UserBuffer;
IO_STACK_LOCATION *Stack = IoGetCurrentIrpStackLocation(Irp);
TUN_FILE_CTX *FileCtx = (TUN_FILE_CTX *)Stack->FileObject->FsContext;
switch (Stack->MajorFunction)
{
case IRP_MJ_READ:
Size = Stack->Parameters.Read.Length;
if (Size < TUN_EXCH_MIN_BUFFER_SIZE_READ)
return STATUS_INVALID_USER_BUFFER;
UserBuffer = &FileCtx->ReadBuffer;
break;
default:
return STATUS_INVALID_PARAMETER;
}
if (Size > TUN_EXCH_MAX_BUFFER_SIZE)
return STATUS_INVALID_USER_BUFFER;
return TunMapUbuffer(UserBuffer, Irp->UserBuffer, Size);
}
_IRQL_requires_max_(DISPATCH_LEVEL)
_Must_inspect_result_
static _Return_type_success_(
@ -737,8 +711,14 @@ _Must_inspect_result_
static NTSTATUS
TunDispatchRead(_Inout_ TUN_CTX *Ctx, _Inout_ IRP *Irp)
{
NTSTATUS Status = TunMapIrp(Irp);
if (!NT_SUCCESS(Status))
IO_STACK_LOCATION *Stack = IoGetCurrentIrpStackLocation(Irp);
ULONG Size = Stack->Parameters.Read.Length;
TUN_MAPPED_UBUFFER *UserBuffer = &((TUN_FILE_CTX *)Stack->FileObject->FsContext)->ReadBuffer;
NTSTATUS Status;
if (Status = STATUS_INVALID_USER_BUFFER, Size < TUN_EXCH_MIN_BUFFER_SIZE_READ || Size > TUN_EXCH_MAX_BUFFER_SIZE)
goto cleanupCompleteRequest;
if (!NT_SUCCESS(Status = TunMapUbuffer(UserBuffer, Irp->UserBuffer, Size)))
goto cleanupCompleteRequest;
KIRQL Irql = ExAcquireSpinLockShared(&Ctx->TransitionLock);