Hesham/wintun
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Synchronize accesses to MiniportAdapterHandle

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Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
This commit is contained in:
Jason A. Donenfeld 2019-06-20 17:02:00 +02:00
parent 17572da83e
commit dea5bfa2d2
1 changed files with 4 additions and 3 deletions
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7
wintun.c
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@ -870,8 +870,9 @@ static NTSTATUS TunDispatch(DEVICE_OBJECT *DeviceObject, IRP *Irp)
BOOLEAN last_handle = InterlockedDecrement64(&ctx->Device.RefCount) <= 0; BOOLEAN last_handle = InterlockedDecrement64(&ctx->Device.RefCount) <= 0;
ExReleaseSpinLockExclusive(&ctx->TransitionLock, irql); ExReleaseSpinLockExclusive(&ctx->TransitionLock, irql);
if (last_handle) { if (last_handle) {
if (ctx->MiniportAdapterHandle) NDIS_HANDLE handle = InterlockedGetPointer(&ctx->MiniportAdapterHandle);
TunIndicateStatus(ctx->MiniportAdapterHandle, MediaConnectStateDisconnected); if (handle)
TunIndicateStatus(handle, MediaConnectStateDisconnected);
TunQueueClear(ctx, NDIS_STATUS_MEDIA_DISCONNECTED); TunQueueClear(ctx, NDIS_STATUS_MEDIA_DISCONNECTED);
} }
IoReleaseRemoveLock(&ctx->Device.RemoveLock, stack->FileObject); IoReleaseRemoveLock(&ctx->Device.RemoveLock, stack->FileObject);
@ -1306,7 +1307,7 @@ static void TunHaltEx(NDIS_HANDLE MiniportAdapterContext, NDIS_HALT_ACTION HaltA
NdisFreeNetBufferListPool(ctx->NBLPool); NdisFreeNetBufferListPool(ctx->NBLPool);
/* MiniportAdapterHandle must not be used in TunDispatch(). After TunHaltEx() returns it is invalidated. */ /* MiniportAdapterHandle must not be used in TunDispatch(). After TunHaltEx() returns it is invalidated. */
ctx->MiniportAdapterHandle = NULL; InterlockedExchangePointer(&ctx->MiniportAdapterHandle, NULL);
ASSERT(InterlockedGet64(&TunAdapterCount) > 0); ASSERT(InterlockedGet64(&TunAdapterCount) > 0);
if (InterlockedDecrement64(&TunAdapterCount) <= 0) if (InterlockedDecrement64(&TunAdapterCount) <= 0)