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Added Try+Except block for ProbeForRead

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Possible security problem under double-fetch conditions. Microsoft says all ProbeForRead calls should be treated as if they could throw exceptions.  SRC: https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/content/wdm/nf-wdm-probeforread
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Michael B 2018-08-22 21:58:58 -04:00 committed by GitHub
parent 2b855c8db7
commit 34b99ea2a5
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 16 additions and 9 deletions
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25
src/Neo6/NDIS6.c
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@ -634,18 +634,25 @@ NTSTATUS NeoNdisDispatch(DEVICE_OBJECT *DeviceObject, IRP *Irp)
{
MmProbeAndLockPages(mdl, KernelMode, IoReadAccess);
}
ProbeForRead(buf, NEO_EXCHANGE_BUFFER_SIZE, 1);
// Write
NeoWrite(buf);
Irp->IoStatus.Information = stack->Parameters.Write.Length;
ok = true;
if (mdl != NULL)
__try
{
ProbeForRead(buf, NEO_EXCHANGE_BUFFER_SIZE, 1);
}
__except (EXCEPTION_EXECUTE_HANDLER)
{
check_ok = false;
}
if (check_ok) {
// Write
NeoWrite(buf);
Irp->IoStatus.Information = stack->Parameters.Write.Length;
ok = true;
if (mdl != NULL)
{
MmUnlockPages(mdl);
IoFreeMdl(mdl);
}
}
}
}