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Примеры ошибок, обнаруженных с помощью …

Примеры ошибок, обнаруженных с помощью диагностики V1004

V1004. Pointer was used unsafely after its check for nullptr.


Rosegarden

V1004 The 'track' pointer was used unsafely after it was verified against nullptr. Check lines: 319, 329. MatrixView.cpp 329


void
MatrixView::slotUpdateWindowTitle(bool m)
{
  ....
  Track *track =
    m_segments[0]->getComposition()->getTrackById(trackId);

  int trackPosition = -1;
  if (track)
      trackPosition = track->getPosition();                // <=

  QString segLabel = strtoqstr(m_segments[0]->getLabel());
  if (segLabel.isEmpty()) {
      segLabel = " ";
  } else {
      segLabel = QString(" \"%1\" ").arg(segLabel);
  }

  QString trkLabel = strtoqstr(track->getLabel());         // <=
  ....
}

Similar errors can be found in some other places:

  • V1004 The 'track' pointer was used unsafely after it was verified against nullptr. Check lines: 2528, 2546. RosegardenDocument.cpp 2546
  • V1004 The 'inst' pointer was used unsafely after it was verified against nullptr. Check lines: 392, 417. ManageMetronomeDialog.cpp 417
  • V1004 The 'controller' pointer was used unsafely after it was verified against nullptr. Check lines: 75, 84. ControllerEventsRuler.cpp 84

Steinberg SDKs

V1004 The 'module' pointer was used unsafely after it was verified against nullptr. Check lines: 76, 84. audiohost.cpp 84


void App::startAudioClient (....)
{
  std::string error;
  module = VST3::Hosting::Module::create (path, error);
  if (!module)
  {
    std::string reason = "Could not create Module for file:";
    reason += path;
    reason += "\nError: ";
    reason += error;
    // EditorHost::IPlatform::instance ().kill (-1, reason);
  }
  auto factory = module->getFactory ();
  ....
}

PDFium

V1004 CWE-476 The 'pObject2Device' pointer was used unsafely after it was verified against nullptr. Check lines: 237, 248. cfx_psrenderer.cpp 248


void CFX_PSRenderer::SetClip_PathStroke(....,
  const CFX_Matrix* pObject2Device, ....)
{
  ....
  if (pObject2Device) {
    ....
  }
  ....
  m_ClipBox.Intersect(
    pObject2Device->TransformRect(rect).GetOuterRect());
  ....
}

The pObject2Device pointer may be null, as evidenced by a check of this pointer for its equality for nullptr. However, the pointer is dereferenced before the preliminary check.

Similar errors can be found in some other places:

  • V1004 CWE-476 The 'pGraphState' pointer was used unsafely after it was verified against nullptr. Check lines: 964, 977. fx_win32_gdipext.cpp 977

PDFium

V1004 CWE-476 The 'pGraphState' pointer was used unsafely after it was verified against nullptr. Check lines: 101, 110. fx_win32_device.cpp 110


HPEN CreatePen(const CFX_GraphStateData* pGraphState, ....)
{
  ....
  if (pGraphState) {
    width = scale * pGraphState->m_LineWidth;
  } else {
    width = 1.0f;
  }
  uint32_t PenStyle = PS_GEOMETRIC;
  if (width < 1) {
    width = 1;
  }
  if (pGraphState->m_DashCount) {
  ....
}

The pGraphState pointer may be null, as evidenced by a check of this pointer for its equality for nullptr. However, the pointer is dereferenced before the preliminary check.


SwiftShader

V1004 CWE-476 The 'shader' pointer was used unsafely after it was verified against nullptr. Check lines: 43, 53. vertexprogram.cpp 53


VertexProgram::VertexProgram(...., const VertexShader *shader)
  : VertexRoutine(state, shader),
    shader(shader),
    r(shader->dynamicallyIndexedTemporaries)
{
  ....
  if(shader && shader->containsBreakInstruction())
  {
    enableBreak = ....;
  }

  if(shader && shader->containsContinueInstruction())
  {
    enableContinue = ....;
  }

  if(shader->isInstanceIdDeclared())
  {
    instanceID = ....;
  }
}

The shader pointer may be null, as evidenced by a check of this pointer for its equality for nullptr. However, the pointer is dereferenced before the preliminary check.


XNU kernel

V1004 CWE-476 The 'fakeif' pointer was used unsafely after it was verified against nullptr. Check lines: 566, 572. if_fake.c 572


static void
feth_start(ifnet_t ifp)
{
  ....
  if_fake_ref  fakeif;
  ....
  if (fakeif != NULL) {
    peer = fakeif->iff_peer;
    flags = fakeif->iff_flags;
  }

  /* check for pending TX */
  m = fakeif->iff_pending_tx_packet;
  ....
}

The check "if (fakeif != NULL)" tells us that the pointer fakeif can be null. However, further the pointer is dereferenced before the preliminary check.

Similar errors can be found in some other places:

  • V1004 CWE-476 The 'rt->rt_ifp' pointer was used unsafely after it was verified against nullptr. Check lines: 138, 140. netsrc.c 140

Krita

V1004 The 'sb' pointer was used unsafely after it was verified against nullptr. Check lines: 665, 670. KisView.cpp 670


void KisView::slotSavingStatusMessage(const QString &text,
                                      int timeout,
                                      bool isAutoSaving)
{
    QStatusBar *sb = statusBar();
    if (sb) // <=
        sb->showMessage(text, timeout);

    KisConfig cfg;

    if (sb->isHidden() || // <=
        (!isAutoSaving && cfg.forceShowSaveMessages()) ||
        (cfg.forceShowAutosaveMessages() && isAutoSaving)) {

        viewManager()->showFloatingMessage(text, QIcon());
    }
}

Similar errors can be found in some other places:

  • V1004 The 'd->viewManager' pointer was used unsafely after it was verified against nullptr. Check lines: 338, 365. KisView.cpp 365

Android

V1004 CWE-476 The 'ain' pointer was used unsafely after it was verified against nullptr. Check lines: 101, 105. rsCpuIntrinsicBLAS.cpp 105


static void setupGEMM(...., const Allocation **ain, ....) {
  uint32_t mm, nn, kk;
  mm = call->M;
  nn = call->N;
  kk = call->K;

  memset(mtls, 0, sizeof(MTLaunchStructForEachBlas));
  mtls->rs        = ctx;
  mtls->sc        = call;
  mtls->dimPtr    = &mtls->fep.dim;
  mtls->fep.dim.x = nn;
  mtls->fep.dim.y = mm;
  mtls->fep.dim.z = kk;
  if (ain) {                            // <=
    memcpy(mtls->ains, ain, 3 * sizeof(ain[0]));
  }
  uint32_t elementBytes = 4;
  if (ain[0]) {                         // <=
    elementBytes =
      ain[0]->getType()->getElement()->getSizeBytes();
  }
  ....
}

Android

V1004 CWE-476 The 'p_clcb->p_srcb' pointer was used unsafely after it was verified against nullptr. Check lines: 695, 701. bta_gattc_act.cc 701


void bta_gattc_disc_cmpl(tBTA_GATTC_CLCB* p_clcb,
                         UNUSED_ATTR tBTA_GATTC_DATA* p_data) {
  ....
  if (p_clcb->status != GATT_SUCCESS) {
    if (p_clcb->p_srcb) {
      std::vector<tBTA_GATTC_SERVICE>().swap(
        p_clcb->p_srcb->srvc_cache);
    }
    bta_gattc_cache_reset(p_clcb->p_srcb->server_bda);
  }  ....
}

LLVM/Clang

V1004 [CWE-476] The 'Ptr' pointer was used unsafely after it was verified against nullptr. Check lines: 729, 738. TargetTransformInfoImpl.h 738


int getGEPCost(Type *PointeeType, const Value *Ptr,
               ArrayRef<const Value *> Operands) {
  ....
  if (Ptr != nullptr) {                                            // <=
    assert(....);
    BaseGV = dyn_cast<GlobalValue>(Ptr->stripPointerCasts());
  }
  bool HasBaseReg = (BaseGV == nullptr);

  auto PtrSizeBits = DL.getPointerTypeSizeInBits(Ptr->getType());  // <=
  ....
}

LLVM/Clang

V1004 [CWE-476] The 'FD' pointer was used unsafely after it was verified against nullptr. Check lines: 3228, 3231. CGDebugInfo.cpp 3231


llvm::DISubprogram *CGDebugInfo::getFunctionFwdDeclOrStub(GlobalDecl GD,
                                                          bool Stub) {
  ....
  auto *FD = dyn_cast<FunctionDecl>(GD.getDecl());
  SmallVector<QualType, 16> ArgTypes;
  if (FD)                                                                // <=
    for (const ParmVarDecl *Parm : FD->parameters())
      ArgTypes.push_back(Parm->getType());
  CallingConv CC = FD->getType()->castAs<FunctionType>()->getCallConv(); // <=
  ....
}

LLVM/Clang

V1004 [CWE-476] The 'PtrTy' pointer was used unsafely after it was verified against nullptr. Check lines: 960, 965. InterleavedLoadCombinePass.cpp 965


static void computePolynomialFromPointer(Value &Ptr, Polynomial &Result,
                                         Value *&BasePtr,
                                         const DataLayout &DL) {
  PointerType *PtrTy = dyn_cast<PointerType>(Ptr.getType());
  if (!PtrTy) {                                                   // <=
    Result = Polynomial();
    BasePtr = nullptr;
  }
  unsigned PointerBits =
      DL.getIndexSizeInBits(PtrTy->getPointerAddressSpace());     // <=
  ....
}

Similar errors can be found in some other places:

  • V1004 [CWE-476] The 'Expr' pointer was used unsafely after it was verified against nullptr. Check lines: 1049, 1078. DebugInfoMetadata.cpp 1078
  • V1004 [CWE-476] The 'PI' pointer was used unsafely after it was verified against nullptr. Check lines: 733, 753. LegacyPassManager.cpp 753
  • V1004 [CWE-476] The 'StatepointCall' pointer was used unsafely after it was verified against nullptr. Check lines: 4371, 4379. Verifier.cpp 4379
  • And 3 additional diagnostic messages.

Amazon FreeRTOS

V1004 [CWE-628] The 'x51ByteHashOidBuffer' pointer was used unsafely after it was verified against nullptr. Check lines: 275, 280. iot_pkcs11.c 280


CK_RV vAppendSHA256AlgorithmIdentifierSequence
             ( uint8_t * x32ByteHashedMessage,
               uint8_t * x51ByteHashOidBuffer )
{
  CK_RV xResult = CKR_OK;
  uint8_t xOidSequence[] = pkcs11STUFF_APPENDED_TO_RSA_SIG;

  if(  ( x32ByteHashedMessage == NULL )
    || ( x51ByteHashOidBuffer == NULL ) )
  {
      xResult = CKR_ARGUMENTS_BAD;
  }

  memcpy( x51ByteHashOidBuffer,
          xOidSequence,
          sizeof( xOidSequence ) );

  memcpy( &x51ByteHashOidBuffer[ sizeof( xOidSequence ) ],
          x32ByteHashedMessage,
          32 );

  return xResult;
}

Similar errors can be found in some other places:

  • V1004 [CWE-628] The 'x32ByteHashedMessage' pointer was used unsafely after it was verified against nullptr. Check lines: 275, 281. iot_pkcs11.c 281

VVVVVV

V1004 The 'pElem' pointer was used unsafely after it was verified against nullptr. Check lines: 1739, 1744. editor.cpp 1744


/** @deprecated use ToElement.
  Return the handle as a TiXmlElement. This may return null.
*/
TiXmlElement *Element() const
{
  return ToElement();
}


void editorclass::load(std::string &_path)
{
  ....

  TiXmlHandle hDoc(&doc);
  TiXmlElement *pElem;
  TiXmlHandle hRoot(0);
  version = 0;

  {
    pElem = hDoc.FirstChildElement().Element();
    // should always have a valid root
    // but handle gracefully if it does
    if (!pElem)
    {
      printf("No valid root! Corrupt level file?\n");
    }

    pElem->QueryIntAttribute("version", &version);    // <=
    // save this for later
    hRoot = TiXmlHandle(pElem);
  }

  ....
}

ORCT2

V1004 [CWE-476] The 'player' pointer was used unsafely after it was verified against nullptr. Check lines: 2085, 2094. libopenrct2 Network.cpp 2094


void Network::ProcessPlayerList()
{
  ....
  auto* player = GetPlayerByID(pendingPlayer.Id);
  if (player == nullptr)
  {
    // Add new player.
    player = AddPlayer("", "");
    if (player)                                          // <=
    {
      *player = pendingPlayer;
       if (player->Flags & NETWORK_PLAYER_FLAG_ISSERVER)
       {
         _serverConnection->Player = player;
       }
    }
    newPlayers.push_back(player->Id);                    // <=
  }
  ....
}

PMDK

V1004 [CWE-119] The '(char *) mt->BaseAddress' pointer was used unsafely after it was verified against nullptr. Check lines: 226, 235. win_mmap.c 235


void win_mmap_fini(void)
{
  ....
    if (mt->BaseAddress != NULL)
      UnmapViewOfFile(mt->BaseAddress);
    size_t release_size =
      (char *)mt->EndAddress - (char *)mt->BaseAddress;
    void *release_addr = (char *)mt->BaseAddress + mt->FileLen;
    mmap_unreserve(release_addr, release_size - mt->FileLen);
  ....
}

DeepSpeech

V1004 The 'aiter' pointer was used unsafely after it was verified against nullptr. Check lines: 107, 119. visit.h 119


template <....>
void Visit(....)
{
  ....
  // Deletes arc iterator if done.
  auto *aiter = arc_iterator[state];
  if ((aiter && aiter->Done()) || !visit) {
    Destroy(aiter, &aiter_pool);
    arc_iterator[state] = nullptr;
    state_status[state] |= kArcIterDone;
  }
  // Dequeues state and marks black if done.
  if (state_status[state] & kArcIterDone) {
    queue->Dequeue();
    visitor->FinishState(state);
    state_status[state] = kBlackState;
    continue;
  }
  const auto &arc = aiter->Value();       // <=
  ....
}

LLVM/Clang

V1004 The 'V' pointer was used unsafely after it was verified against nullptr. Check lines: 61, 65. TraceTests.cpp 65


bool VerifyObject(llvm::yaml::Node &N,
                  std::map<std::string, std::string> Expected) {
  ....
  auto *V = llvm::dyn_cast_or_null<llvm::yaml::ScalarNode>(Prop.getValue());
  if (!V) {
    ADD_FAILURE() << KS << " is not a string";
    Match = false;
  }
  std::string VS = V->getValue(Tmp).str();
  ....
}

Snort

V1004 The 'ppm_pt' pointer was used unsafely after it was verified against nullptr. Check lines: 353, 354. detect.c 354


ppm_pkt_timer_t  *ppm_pt = NULL;
....

#define PPM_TOTAL_PKT_TIME() \
    if( ppm_pt) \
{ \
    ppm_pt->tot = \
      ppm_cur_time - ppm_pt->start - ppm_pt->subtract; \
}

#define PPM_ACCUM_PKT_TIME() \
snort_conf->ppm_cfg.tot_pkt_time += ppm_pt->tot;

int Preprocess(Packet * p)
{
  ....
  PPM_TOTAL_PKT_TIME();
  PPM_ACCUM_PKT_TIME();
  ....
}

LLVM/Clang

V1004 [CWE-476, CERT-EXP34-C] The 'Label' pointer was used unsafely after it was verified against nullptr. Check lines: 74, 81. DwarfCompileUnit.cpp 81


void DwarfCompileUnit::addLabelAddress(DIE &Die, dwarf::Attribute Attribute,
                                       const MCSymbol *Label) {
  ....
  if (Label)
    DD->addArangeLabel(SymbolCU(this, Label));

  bool UseAddrOffsetFormOrExpressions =
      DD->useAddrOffsetForm() || DD->useAddrOffsetExpressions();

  const MCSymbol *Base = nullptr;
  if (Label->isInSection() && UseAddrOffsetFormOrExpressions)
    Base = DD->getSectionLabel(&Label->getSection());
  ....
}

LLVM/Clang

V1004 [CWE-476, CERT-EXP34-C] The 'DI' pointer was used unsafely after it was verified against nullptr. Check lines: 3349, 3351. CodeGenDAGPatterns.cpp 3351


void TreePattern::error(const Twine &Msg) {
  if (HasError)
    return;
  dump();
  PrintError(TheRecord->getLoc(), "In " + TheRecord->getName() + ": " + Msg);
  HasError = true;
}

static bool HandleUse(....)
{
  ....
  if (Pat->isLeaf()) {
    DefInit *DI = dyn_cast<DefInit>(Pat->getLeafValue());
    if (!DI)
      I.error("Input $" + Pat->getName() + " must be an identifier!");
    Rec = DI->getDef();
  }
  ....
}

Similar errors can be found in some other places:

  • V1004 [CWE-476, CERT-EXP34-C] The 'OpDef' pointer was used unsafely after it was verified against nullptr. Check lines: 2843, 2844. CodeGenDAGPatterns.cpp 2844
  • V1004 [CWE-476, CERT-EXP34-C] The 'Val' pointer was used unsafely after it was verified against nullptr. Check lines: 3418, 3420. CodeGenDAGPatterns.cpp 3420

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