RtlpHpFixedVsFree

VOID __stdcall RtlpHpFixedVsFree(VOID *HeapAddress, VOID *Address, UINT64 a3, UINT64 a4){
  unsigned __int64 v4; 
  unsigned __int64 v6; 
  unsigned __int64 Param2; 
  VOID *v8; 
  int v9; 
  unsigned __int8 v10; 
  __m128i v11; 
  unsigned __int64 *v12; 
  unsigned __int64 v13; 
  unsigned __int64 *v14; 
  bool i; 
  unsigned __int8 v16; 
  UINT8 v17; 
  int v18; 
  unsigned __int64 v19; 
  _ETHREAD *CurrentThread; 
  unsigned int SessionId; 
  unsigned __int8 v22; 
  int v23; 
  __int64 v24; 
  _KLOCK_ENTRY *v25; 
  __int64 v26; 
  _RTL_BITMAP_EX BitMapHeader; 
  unsigned __int64 Param1; 
  UINT64 a3a; 

  v4 = (unsigned __int64)(unsigned int)a3 >> 12;
  v6 = (unsigned __int64)((_BYTE *)Address - (_BYTE *)HeapAddress) >> 12;
  Param2 = (unsigned int)a4;
  Param1 = (unsigned int)a3;
  v8 = Address;
  v9 = a4 & 1;
  if( (a4 & 1) != 0 )
  {
    v10 = -1;
  }
  else
  {
    v17 = RtlpHpAcquireLockExclusive((_EX_PUSH_LOCK *)HeapAddress + 3, *((_DWORD *)HeapAddress + 8));
    v8 = Address;
    v10 = v17;
  }
  v11 = *((__m128i *)HeapAddress + 3);
  BitMapHeader.SizeOfBitMap = *((_QWORD *)HeapAddress + 6);
  BitMapHeader.Buffer = (unsigned __int64 *)((unsigned __int64)HeapAddress ^ _mm_srli_si128(v11, 8).m128i_u64[0]);
  if( v6 >= BitMapHeader.SizeOfBitMap )
    goto LABEL_20;
  if( v4 <= 1 )
  {
    if( v4 != 1 )
      goto LABEL_20;
    v16 = _bittest64((const signed __int64 *)BitMapHeader.Buffer, v6);
LABEL_19:
    if( !v16 )
      goto LABEL_20;
    goto LABEL_8;
  }
  if( BitMapHeader.SizeOfBitMap - v6 < v4 )
    goto LABEL_20;
  v12 = &BitMapHeader.Buffer[v6 >> 6];
  v13 = *v12;
  v14 = &BitMapHeader.Buffer[(v6 + v4 - 1) >> 6];
  if( v12 == v14 )
  {
    if( ((0xFFFFFFFFFFFFFFFFui64 >> (64 - (unsigned __int8)v4) << v6) & v13) == 0xFFFFFFFFFFFFFFFFui64 >> (64 - (unsigned __int8)v4) << v6 )
      goto LABEL_8;
LABEL_20:
    RtlpLogHeapFailure(heap_failure_block_not_busy, HeapAddress, v8, (VOID *)Param1, (VOID *)Param2);
    __fastfail(0x32u);
  }
  for( i = ((-1i64 << v6) & v13) == -1i64 << v6; ; i = *v12 == -1i64 )
  {
    if( !i )
      goto LABEL_20;
    if( ++v12 == v14 )
      break;
  }
  if( ((0xFFFFFFFFFFFFFFFFui64 >> ~((unsigned __int8)v6 + (unsigned __int8)v4 - 1)) & *v12) != 0xFFFFFFFFFFFFFFFFui64 >> ~((unsigned __int8)v6 + (unsigned __int8)v4 - 1) )
  {
    v16 = 0;
    goto LABEL_19;
  }
LABEL_8:
  RtlClearBitsEx(&BitMapHeader, v6, v4);
  if( !v9 )
  {
    v18 = *((_DWORD *)HeapAddress + 8);
    v19 = (unsigned __int64)HeapAddress + 24;
    if( v18 )
    {
      ExReleaseSpinLockExclusiveFromDpcLevel((INT64 *)v19);
      __writecr8(v10);
    }
    else
    {
      if( (_InterlockedExchangeAdd64((volatile signed __int64 *)v19, 0xFFFFFFFFFFFFFFFFui64) & 6) == 2 )
        ExfTryToWakePushLock((_EX_PUSH_LOCK *)v19);
      LODWORD(a3a) = 0;
      CurrentThread = (_ETHREAD *)KeGetCurrentThread();
      if( MiGetSystemRegionType(v19) == 1 )
        SessionId = MmGetSessionIdEx(CurrentThread->Tcb.ApcState.Process);
      else
        SessionId = -1;
      --CurrentThread->Tcb.SpecialApcDisable;
      v22 = ++CurrentThread->Tcb.AbAllocationRegionCount;
      v23 = ((char)CurrentThread->Tcb.AbEntrySummary | (char)CurrentThread->Tcb.AbOrphanedEntrySummary) ^ 0x3F;
      while( 1 )
      {
        i = !_BitScanReverse((unsigned int *)&v24, v23);
        if( i )
          goto LABEL_29;
        v25 = &CurrentThread->Tcb.LockEntries[v24];
        v23 &= ~(1 << v24);
        if( (v25->AcquiredByte & 1) != 0
          && (v25->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 & 1) == 0
          && (v25->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 & 0x7FFFFFFFFFFFFFFCi64) == (v19 & 0x7FFFFFFFFFFFFFFCi64)
          && v25->LockState.SessionId == SessionId )
        {
          v25->AcquiredByte &= ~1u;
          if( v25->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 )
            break;
        }
      }
      if( !v25 )
      {
LABEL_29:
        if( (*(&CurrentThread->Tcb.MiscFlags + 1) & 0x10000) == 0 )
          KeBugCheckEx(0x162u, CurrentThread, (PVOID)v19, (PVOID)SessionId, 0i64);
        goto LABEL_41;
      }
      v25->CrossThreadReleasableAndBusyByte |= 2u;
      if( v25->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 < 0 )
        KiAbEntryRemoveFromTree(v25);
      LODWORD(a3a) = v25->BoostBitmap.AllFields & 0x1FFFF;
      v25->BoostBitmap.AllFields &= 0xFFFE0000;
      v25->ThreadLocalFlags &= ~1u;
      v25->LockState.$E8276A2CF8B819ED32D1B6FEB35D730A::_bf_0 = 0i64;
      v26 = v25 - CurrentThread->Tcb.LockEntries;
      if( v22 == 1 )
        CurrentThread->Tcb.AbEntrySummary |= 1 << v26;
      else
        _InterlockedOr8((volatile signed __int8 *)&CurrentThread->Tcb.AbOrphanedEntrySummary, 1 << v26);
LABEL_41:
      --CurrentThread->Tcb.AbAllocationRegionCount;
      KiAbThreadRemoveBoosts(&CurrentThread->Tcb, (VOID *)v19, &a3a);
      i = CurrentThread->Tcb.SpecialApcDisable++ == -1;
      if( i
        && ($F25F8C4BA33AF922A5F1AF68CD89DDDF *)CurrentThread->Tcb.ApcState.ApcListHead[0].Flink != &CurrentThread->Tcb.152 )
      {
        KiCheckForKernelApcDelivery();
      }
      KiLeaveGuardedRegionUnsafe((__int64)KeGetCurrentThread());
    }
  }
}

Referenced by: