Re: [PATCH 4/4] ntoskrnl.exe: Set the IRP output buffer unless the status has both high bits set.

[Dmitry Timoshkov]

Zebediah Figura  wrote:
> -
>    if ((irp->IoStatus.u.Status & 0xc0000000) != 0xc0000000)

This is STATUS_SEVERITY_ERROR, and there's NT_ERROR() macro to check for it.