Hesham/wintun
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Add some basic assert checks

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Signed-off-by: Simon Rozman <simon@rozman.si>
This commit is contained in:
Simon Rozman 2019-03-22 13:38:35 +01:00 committed by Jason A. Donenfeld
parent b6f0e07c2f
commit 9fbc8091ab
1 changed files with 7 additions and 1 deletions
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8
wintun.c
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@ -166,6 +166,7 @@ static void TunCompleteRequest(_Inout_ IRP *Irp, _In_ ULONG_PTR Information, _In
_IRQL_requires_same_
static NTSTATUS TunCheckForPause(_Inout_ TUN_CTX *ctx, _In_ LONG64 increment)
{
ASSERT(InterlockedGet64(&ctx->ActiveTransactionCount) <= MAXLONG64 - increment);
InterlockedAdd64(&ctx->ActiveTransactionCount, increment);
return
InterlockedGet((LONG *)&ctx->State) != TUN_STATE_RUNNING ? STATUS_NDIS_PAUSED :
@ -176,6 +177,7 @@ static NTSTATUS TunCheckForPause(_Inout_ TUN_CTX *ctx, _In_ LONG64 increment)
_IRQL_requires_max_(DISPATCH_LEVEL)
static void TunCompletePause(_Inout_ TUN_CTX *ctx, _In_ LONG64 decrement)
{
ASSERT(decrement <= InterlockedGet64(&ctx->ActiveTransactionCount));
if (!InterlockedSubtract64(&ctx->ActiveTransactionCount, decrement) &&
InterlockedCompareExchange((LONG *)&ctx->State, TUN_STATE_PAUSED, TUN_STATE_PAUSING) == TUN_STATE_PAUSING)
NdisMPauseComplete(ctx->MiniportAdapterHandle);
@ -350,6 +352,7 @@ static NTSTATUS TunDispatchCreate(DEVICE_OBJECT *DeviceObject, IRP *Irp)
goto cleanup_complete_req;
}
ASSERT(InterlockedGet64(&ctx->Device.RefCount) < MAXLONG64);
InterlockedIncrement64(&ctx->Device.RefCount);
TunIndicateStatus(ctx);
status = STATUS_SUCCESS;
@ -371,6 +374,7 @@ static NTSTATUS TunDispatchClose(DEVICE_OBJECT *DeviceObject, IRP *Irp)
goto cleanup_complete_req;
}
ASSERT(InterlockedGet64(&ctx->Device.RefCount) > 0);
InterlockedDecrement64(&ctx->Device.RefCount);
TunIndicateStatus(ctx);
status = STATUS_SUCCESS;
@ -448,7 +452,6 @@ static NTSTATUS TunDispatchWrite(DEVICE_OBJECT *DeviceObject, IRP *Irp)
if (!mdl)
goto skip_packet;
#pragma warning(suppress: 6014) /* Leaking memory 'nbl'. Note: 'nbl' is aliased in nbl_head/tail list and freed in TunReturnNetBufferLists. */
NET_BUFFER_LIST *nbl = NdisAllocateNetBufferAndNetBufferList(ctx->NBLPool, 0, 0, mdl, 0, p->Size);
if (!nbl)
goto cleanup_NdisFreeMdl;
@ -601,6 +604,7 @@ static MINIPORT_RETURN_NET_BUFFER_LISTS TunReturnNetBufferLists;
_Use_decl_annotations_
static void TunReturnNetBufferLists(NDIS_HANDLE MiniportAdapterContext, PNET_BUFFER_LIST NetBufferLists, ULONG ReturnFlags)
{
ASSERTMSG("TunReturnNetBufferLists() should not be called as NBLs are delivered using NDIS_RECEIVE_FLAGS_RESOURCES flag in NdisMIndicateReceiveNetBufferLists().", 0);
}
static MINIPORT_CANCEL_SEND TunCancelSend;
@ -901,6 +905,8 @@ static void TunHaltEx(NDIS_HANDLE MiniportAdapterContext, NDIS_HALT_ACTION HaltA
if (InterlockedGet((LONG *)&ctx->State) != TUN_STATE_PAUSED)
return;
ASSERT(!InterlockedGet64(&ctx->ActiveTransactionCount));
/* Reset adapter context in device object, as Windows keep calling dispatch handlers even after NdisDeregisterDeviceEx(). */
TUN_CTX **control_device_extension = (TUN_CTX **)NdisGetDeviceReservedExtension(ctx->Device.Object);
if (control_device_extension)