MiDereferenceExtendInfo

VOID __stdcall MiDereferenceExtendInfo(_MMVAD *Vad, _CONTROL_AREA *ControlArea){
  _ETHREAD *CurrentThread; 
  void *ExtendedInfo; 
  unsigned int SessionId; 
  _ETHREAD *v7; 
  unsigned __int8 v8; 
  int v9; 
  bool v10; 
  __int64 v11; 
  _KLOCK_ENTRY *v12; 
  __int64 v13; 
  UINT64 a3; 

  CurrentThread = (_ETHREAD *)KeGetCurrentThread();
  ExtendedInfo = 0i64;
  --CurrentThread->Tcb.SpecialApcDisable;
  ExAcquirePushLockExclusiveEx(&stru_140C4C6D0, 0i64);
  SessionId = -1;
  if( !--*(_DWORD *)(*(_QWORD *)&Vad->u4.SequentialVa + 8i64) )
  {
    ExtendedInfo = Vad->u4.ExtendedInfo;
    ControlArea->Segment->ExtendInfo = 0i64;
  }
  if( (_InterlockedExchangeAdd64(&stru_140C4C6D0._bf_0, 0xFFFFFFFFFFFFFFFFui64) & 6) == 2 )
    ExfTryToWakePushLock(&stru_140C4C6D0);
  LODWORD(a3) = 0;
  v7 = (_ETHREAD *)KeGetCurrentThread();
  if( MiGetSystemRegionType((UINT64)&stru_140C4C6D0) == 1 )
    SessionId = MmGetSessionIdEx(v7->Tcb.ApcState.Process);
  --v7->Tcb.SpecialApcDisable;
  v8 = ++v7->Tcb.AbAllocationRegionCount;
  v9 = ((char)v7->Tcb.AbEntrySummary | (char)v7->Tcb.AbOrphanedEntrySummary) ^ 0x3F;
  while( 1 )
  {
    v10 = !_BitScanReverse((unsigned int *)&v11, v9);
    if( v10 )
      break;
    v12 = &v7->Tcb.LockEntries[v11];
    v9 &= ~(1 << v11);
    if( (v12->AcquiredByte & 1) != 0
      && (v12->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 & 1) == 0
      && (v12->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 & 0x7FFFFFFFFFFFFFFCi64) == ((unsigned __int64)&stru_140C4C6D0 & 0x7FFFFFFFFFFFFFFCi64)
      && v12->LockState.SessionId == SessionId )
    {
      v12->AcquiredByte &= ~1u;
      if( v12->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 )
      {
        if( v12 )
        {
          v12->CrossThreadReleasableAndBusyByte |= 2u;
          if( v12->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 < 0 )
            KiAbEntryRemoveFromTree(v12);
          LODWORD(a3) = v12->BoostBitmap.AllFields & 0x1FFFF;
          v12->BoostBitmap.AllFields &= 0xFFFE0000;
          v12->ThreadLocalFlags &= ~1u;
          v12->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 = 0i64;
          v13 = v12 - v7->Tcb.LockEntries;
          if( v8 == 1 )
            v7->Tcb.AbEntrySummary |= 1 << v13;
          else
            _InterlockedOr8((volatile signed __int8 *)&v7->Tcb.AbOrphanedEntrySummary, 1 << v13);
          goto LABEL_19;
        }
        break;
      }
    }
  }
  if( (*(&v7->Tcb.MiscFlags + 1) & 0x10000) == 0 )
    KeBugCheckEx(0x162u, v7, &stru_140C4C6D0, (PVOID)SessionId, 0i64);
LABEL_19:
  --v7->Tcb.AbAllocationRegionCount;
  KiAbThreadRemoveBoosts(&v7->Tcb, &stru_140C4C6D0, &a3);
  v10 = v7->Tcb.SpecialApcDisable++ == -1;
  if( v10 && ($F25F8C4BA33AF922A5F1AF68CD89DDDF *)v7->Tcb.ApcState.ApcListHead[0].Flink != &v7->Tcb.152 )
    KiCheckForKernelApcDelivery();
  KiLeaveGuardedRegionUnsafe((__int64)CurrentThread);
  if( ExtendedInfo )
    ExFreePoolWithTag(ExtendedInfo, 0);
}

Referenced by: