ExpSvmDereferenceDevice

NTSTATUS __stdcall ExpSvmDereferenceDevice(_EXP_SVM_DEVICE *Device){
  NTSTATUS v2; 
  _ETHREAD *CurrentThread; 
  _ETHREAD *v4; 
  unsigned __int8 AbEntrySummary; 
  unsigned int v6; 
  __int64 AbOrphanedEntrySummary; 
  __int64 v8; 
  __int64 v9; 
  NTSTATUS SessionId; 
  bool v11; 
  void(__fastcall *v12)(__int64, char *); 
  __int64 v13; 
  __int64 v14; 
  _EXP_SVM_DEVICE **v15; 
  _ETHREAD *v16; 
  unsigned __int8 v17; 
  int v18; 
  _KLOCK_ENTRY *v19; 
  __int64 v20; 
  __int64 v21; 
  UINT64 v23; 
  char a3[12]; 
  int v25; 

  *(_QWORD *)&a3[4] = 0i64;
  v25 = 0;
  v2 = 0;
  CurrentThread = (_ETHREAD *)KeGetCurrentThread();
  --CurrentThread->Tcb.SpecialApcDisable;
  *(_DWORD *)a3 = 0;
  v4 = (_ETHREAD *)KeGetCurrentThread();
  --v4->Tcb.SpecialApcDisable;
  if( ++v4->Tcb.AbAllocationRegionCount != 1 )
    KeBugCheckEx(0x192u, v4, (char *)&WheapDeferredInternalLogsEventLock + 2280, (PVOID)KeGetCurrentIrql(), 0i64);
  AbEntrySummary = v4->Tcb.AbEntrySummary;
  v6 = -1;
  HIDWORD(v23) = 0;
  if( !AbEntrySummary )
  {
    if( !v4->Tcb.AbOrphanedEntrySummary )
    {
      v9 = 0i64;
      goto LABEL_7;
    }
    AbOrphanedEntrySummary = v4->Tcb.AbOrphanedEntrySummary;
    v4->Tcb.AbOrphanedEntrySummary = 0;
    AbEntrySummary = AbOrphanedEntrySummary | v4->Tcb.AbEntrySummary;
  }
  _BitScanForward((unsigned int *)&v8, AbEntrySummary);
  HIDWORD(v23) = v8;
  v4->Tcb.AbEntrySummary = AbEntrySummary & ~(1 << v8);
  v9 = (__int64)&v4->Tcb.LockEntries[v8];
  if( v9 )
  {
    if( (unsigned __int64)&WheapDeferredInternalLogsEventLock + 2280 >= 0xFFFF800000000000ui64
      && *((_BYTE *)&stru_140C4DB30
         + ((((unsigned __int64)&WheapDeferredInternalLogsEventLock + 2280) >> 39) & 0x1FF)
         + 6872) == 1 )
    {
      SessionId = MmGetSessionIdEx(v4->Tcb.ApcState.Process);
    }
    else
    {
      SessionId = -1;
    }
    *(_DWORD *)(v9 + 40) = SessionId;
    *(_QWORD *)(v9 + 32) = ((unsigned __int64)&WheapDeferredInternalLogsEventLock + 2280) & 0x7FFFFFFFFFFFFFFCi64;
    goto LABEL_14;
  }
LABEL_7:
  _interlockedbittestandset((volatile signed __int32 *)&v4->Tcb.116 + 1, 0x10u);
LABEL_14:
  --v4->Tcb.AbAllocationRegionCount;
  KiAbThreadRemoveBoosts(&v4->Tcb, (char *)&WheapDeferredInternalLogsEventLock + 2280, (UINT64 *)a3);
  v11 = v4->Tcb.SpecialApcDisable++ == -1;
  if( v11 && ($F25F8C4BA33AF922A5F1AF68CD89DDDF *)v4->Tcb.ApcState.ApcListHead[0].Flink != &v4->Tcb.152 )
    KiCheckForKernelApcDelivery();
  if( _interlockedbittestandset64((volatile signed __int32 *)&WheapDeferredInternalLogsEventLock + 570, 0i64) )
    ExfAcquirePushLockExclusiveEx(
      (_EX_PUSH_LOCK *)&WheapDeferredInternalLogsEventLock + 285,
      (VOID *)v9,
      (char *)&WheapDeferredInternalLogsEventLock + 2280);
  if( v9 )
    *(_BYTE *)(v9 + 26) |= 1u;
  v11 = Device[6]-- == 1;
  if( v11 )
  {
    v12 = (void(__fastcall *)(__int64, char *))*((_QWORD *)Device + 10);
    v13 = *((_QWORD *)Device + 5);
    *(_DWORD *)&a3[4] = 7;
    v12(v13, &a3[4]);
    v2 = (*((__int64(__fastcall **)(_QWORD, _QWORD))HalIommuDispatch + 7))(
           *(&WheapDeferredInternalLogsEventLock + 298),
           *((_QWORD *)Device + 15));
    _InterlockedAdd((_DWORD *)&stru_140CF2E80 + 1830, 0xFFFFFFFF);
    v14 = *(_QWORD *)Device;
    if( *(_EXP_SVM_DEVICE **)(*(_QWORD *)Device + 8i64) != Device
      || (v15 = (_EXP_SVM_DEVICE **)*((_QWORD *)Device + 1), *v15 != Device) )
    {
      __fastfail(3u);
    }
    *v15 = (_EXP_SVM_DEVICE *)v14;
    *(_QWORD *)(v14 + 8) = v15;
    (*((void(__fastcall **)(_QWORD))Device + 7))(*((_QWORD *)Device + 5));
    ExFreePoolWithTag(Device, 0);
  }
  if( (_InterlockedExchangeAdd64((_QWORD *)&WheapDeferredInternalLogsEventLock + 285, 0xFFFFFFFFFFFFFFFFui64) & 6) == 2 )
    ExfTryToWakePushLock((_EX_PUSH_LOCK *)&WheapDeferredInternalLogsEventLock + 285);
  LODWORD(v23) = 0;
  v16 = (_ETHREAD *)KeGetCurrentThread();
  if( MiGetSystemRegionType((UINT64)&WheapDeferredInternalLogsEventLock + 2280) == 1 )
    v6 = MmGetSessionIdEx(v16->Tcb.ApcState.Process);
  --v16->Tcb.SpecialApcDisable;
  v17 = ++v16->Tcb.AbAllocationRegionCount;
  v18 = ((char)v16->Tcb.AbEntrySummary | (char)v16->Tcb.AbOrphanedEntrySummary) ^ 0x3F;
  while( 1 )
  {
    v11 = !_BitScanReverse((unsigned int *)&v20, v18);
    if( v11 )
      goto LABEL_37;
    v19 = &v16->Tcb.LockEntries[v20];
    v18 &= ~(1 << v20);
    if( (v19->AcquiredByte & 1) != 0
      && (v19->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 & 1) == 0
      && (v19->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 & 0x7FFFFFFFFFFFFFFCi64) == (((unsigned __int64)&WheapDeferredInternalLogsEventLock
                                                                                              + 2280) & 0x7FFFFFFFFFFFFFFCi64)
      && v19->LockState.SessionId == v6 )
    {
      v19->AcquiredByte &= ~1u;
      if( v19->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 )
        break;
    }
  }
  if( !v19 )
  {
LABEL_37:
    if( (*(&v16->Tcb.MiscFlags + 1) & 0x10000) == 0 )
      KeBugCheckEx(0x162u, v16, (char *)&WheapDeferredInternalLogsEventLock + 2280, (PVOID)v6, 0i64);
    goto LABEL_44;
  }
  v19->CrossThreadReleasableAndBusyByte |= 2u;
  if( v19->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 < 0 )
    KiAbEntryRemoveFromTree(v19);
  LODWORD(v23) = v19->BoostBitmap.AllFields & 0x1FFFF;
  v19->BoostBitmap.AllFields &= 0xFFFE0000;
  v19->ThreadLocalFlags &= ~1u;
  v19->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 = 0i64;
  v21 = v19 - v16->Tcb.LockEntries;
  if( v17 == 1 )
    v16->Tcb.AbEntrySummary |= 1 << v21;
  else
    _InterlockedOr8((volatile signed __int8 *)&v16->Tcb.AbOrphanedEntrySummary, 1 << v21);
LABEL_44:
  --v16->Tcb.AbAllocationRegionCount;
  KiAbThreadRemoveBoosts(&v16->Tcb, (char *)&WheapDeferredInternalLogsEventLock + 2280, &v23);
  v11 = v16->Tcb.SpecialApcDisable++ == -1;
  if( v11 && ($F25F8C4BA33AF922A5F1AF68CD89DDDF *)v16->Tcb.ApcState.ApcListHead[0].Flink != &v16->Tcb.152 )
    KiCheckForKernelApcDelivery();
  KiLeaveGuardedRegionUnsafe((__int64)CurrentThread);
  return v2;
}

Referenced by: