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Examples of errors detected by the V309…

Examples of errors detected by the V3095 diagnostic

April 5, 2021

V3095. The object was used before it was verified against null. Check lines: N1, N2.


WPF samples by Microsoft

V3095 The 'htmlLiElement' object was used before it was verified against null. Check lines: 916, 936. HtmlToXamlConverter.cs 916


private static XmlElement AddOrphanListItems(....)
{
  Debug.Assert(htmlLiElement.LocalName.ToLower() == "li");
  ....
  XmlNode htmlChildNode = htmlLiElement;
  var htmlChildNodeName = htmlChildNode == null
      ? null
      : htmlChildNode.LocalName.ToLower();
  ....
}

Old NASA World Wind (C#)

V3095 The 'this.linePoints' object was used before it was verified against null. Check lines: 332, 346. PathLine.cs 332


public override void Render(DrawArgs drawArgs)
{
  ....
  if(this.linePoints.Length > 1)    // <=
  {
    ....
    if(this.linePoints != null)     // <=
    {
      ....
    }
  }
  ....
}

Also see V3022


FlashDevelop

V3095 The 'node' object was used before it was verified against null. Check lines: 364, 365. ProjectContextMenu.cs 364


private void AddFolderItems(MergableMenu menu, string path)
{
  ....
  DirectoryNode node = projectTree.SelectedNode
    as DirectoryNode;
  if (node.InsideClasspath == node)
    menu.Add(RemoveSourcePath, 2, true);
  else if (node != null && ....)
  {
    menu.Add(AddSourcePath, 2, false);
  }
  ....
}

Unity3D

V3095 The 'uv2.gameObject' object was used before it was verified against null. Check lines: 1719, 1731. UnityEngine.Networking NetworkServer.cs 1719


static public bool SpawnObjects()
{
  ....
  if (uv2.gameObject.hideFlags == HideFlags.NotEditable ||
      uv2.gameObject.hideFlags == HideFlags.HideAndDontSave)
    continue;
  ....
  if (uv2.gameObject == null)
    continue;
  ....
}

Similar errors can be found in some other places:

  • V3095 The 'm_HorizontalScrollbarRect' object was used before it was verified against null. Check lines: 214, 220. UnityEngine.UI ScrollRect.cs 214
  • V3095 The 'm_VerticalScrollbarRect' object was used before it was verified against null. Check lines: 215, 221. UnityEngine.UI ScrollRect.cs 215

MSBuild

V3095 The 'diskRoots' object was used before it was verified against null. Check lines: 2656, 2659. ToolLocationHelper.cs 2656


private static void ExtractSdkDiskRootsFromEnvironment
(List<string> diskRoots, string directoryRoots)
{
  if (!String.IsNullOrEmpty(directoryRoots))
  {
    ....
    diskRoots.AddRange(splitRoots);  // <=
  }

  if (diskRoots != null)             // <=
  ....
}

Similar errors can be found in some other places:

  • V3095 The 'propertyValue' object was used before it was verified against null. Check lines: 2760, 2799. Expander.cs 2760
  • V3095 The 'publicKeyToken' object was used before it was verified against null. Check lines: 232, 236. GenerateBindingRedirects.cs 231
  • V3095 The 'searchLocation' object was used before it was verified against null. Check lines: 170, 178. Resolver.cs 170
  • And 7 additional diagnostic messages.

GitExtensions

V3095 The 'data' object was used before it was verified against null. Check lines: 319, 376. GitCommands RevisionGraph.cs 319


void DataReceived(string data)
{
  if (data.StartsWith(CommitBegin)) // <=
  {
      ....
  }

  if (!string.IsNullOrEmpty(data))
  {
      ....
  }
}

Similar errors can be found in some other places:

  • V3095 The 'line' object was used before it was verified against null. Check lines: 1979, 1981. GitCommands GitModule.cs 1979
  • V3095 The 'head' object was used before it was verified against null. Check lines: 2414, 2422. GitCommands GitModule.cs 2414

PowerShell

V3095 The 'inputParameters' object was used before it was verified against null. Check lines: 430, 436. System.Management.Automation FormatViewGenerator_Complex.cs 430


internal ComplexViewEntry
  GenerateView(....,
               FormattingCommandLineParameters inputParameters)
{
  _complexSpecificParameters =
    (ComplexSpecificParameters)inputParameters.shapeParameters;

  int maxDepth = _complexSpecificParameters.maxDepth;
  ....
  if (inputParameters != null)
    mshParameterList = inputParameters.mshParameterList;
  ....
}

PowerShell

V3095 The 'other.Parameters' object was used before it was verified against null. Check lines: 189, 192. System.Management.Automation CommandMetadata.cs 189


public CommandMetadata(CommandMetadata other)
{
  ....
  _parameters = new Dictionary<string, ParameterMetadata>(
    other.Parameters.Count, StringComparer.OrdinalIgnoreCase);

  // deep copy
  if (other.Parameters != null)
  ....
}

Orchard CMS

V3095 The 'Delegate' object was used before it was verified against null. Check lines: 37, 40. SerializableDelegate.cs 37


void ISerializable.GetObjectData(
  SerializationInfo info,
  StreamingContext context)
{
  info.AddValue("delegateType", Delegate.GetType());
  ....
  if (.... && Delegate != null)
  {
    ....
  }
}

Similar errors can be found in some other places:

  • V3095 The 'widget' object was used before it was verified against null. Check lines: 81, 93. TagsWidgetCommands.cs 81

Umbraco

V3095 The 'dataset' object was used before it was verified against null. Check lines: 48, 49. ImageCropperBaseExtensions.cs 48


internal static ImageCropData GetCrop(....)
{
  var imageCropDatas = dataset.ToArray();
  if (dataset == null || imageCropDatas.Any() == false)
    return null;
  ....
}

Similar errors can be found in some other places:

  • V3095 The 'display.PropertyEditor' object was used before it was verified against null. Check lines: 30, 43. ContentPropertyDisplayConverter.cs 30
  • V3095 The 'typedSource' object was used before it was verified against null. Check lines: 164, 198. DynamicQueryable.cs 164
  • V3095 The 'attempt.Result' object was used before it was verified against null. Check lines: 90, 113. DynamicPublishedContent.cs 90
  • And 8 additional diagnostic messages.

SharpDevelop

V3095 The 'position' object was used before it was verified against null. Check lines: 204, 206. Task.cs 204


public void JumpToPosition()
{
  if (hasLocation && !position.IsDeleted)
    ....
  else if (position != null)
    ....
}

Media Portal 2

V3095 The 'result' object was used before it was verified against null. Check lines: 1292, 1294. VideoMetadataExtractor.cs 1292


public bool TryExtractMetadata(....)
{
  using (Stream stream = fsra.OpenRead())
    result.MimeType = MimeTypeDetector.GetMimeType(
      stream, DEFAULT_MIMETYPE);

  if (result != null)                         // <=
  {
    ....
  }
}

Similar errors can be found in some other places:

  • V3095 The '_type' object was used before it was verified against null. Check lines: 104, 106. AbstractProperty.cs 104
  • V3095 The 'seasonDetail' object was used before it was verified against null. Check lines: 360, 361. OmDbWrapper.cs 360

PascalABC.NET

V3095 The 'VisualEnvironmentCompiler.RemoteCompiler' object was used before it was verified against null. Check lines: 52, 54. CompilerController CompilerControllerPlugin.cs 52


public CompilerController_VisualPascalABCPlugin(....)
{
  ....
  VisualEnvironmentCompiler.RemoteCompiler.InternalDebug.
    RunOnMono = CompilerInformation.cbRunMono.Checked;
  ....
  if (VisualEnvironmentCompiler.RemoteCompiler != null)
    ....
}

Similar errors can be found in some other places:

  • V3095 The 'cun' object was used before it was verified against null. Check lines: 400, 401. Compiler PCUReader.cs 400
  • V3095 The 'cnfn.ConnectedToType.element_type' object was used before it was verified against null. Check lines: 2918, 2930. Compiler PCUReader.cs 2918
  • V3095 The '_currentTreeNode' object was used before it was verified against null. Check lines: 590, 593. TreeConverter CapturedVariablesTreeBuilder.cs 590
  • And 7 additional diagnostic messages.

Unity C# reference source code

V3095 CWE-476 The 'element' object was used before it was verified against null. Check lines: 101, 107. StyleContext.cs 101


public override void
OnBeginElementTest(VisualElement element, ....)
{
  if (element.IsDirty(ChangeType.Styles))
  {
    ....
  }

  if (element != null && element.styleSheets != null)
  {
    ....
  }
  ....
}

Similar errors can be found in some other places:

  • V3095 CWE-476 The 'property' object was used before it was verified against null. Check lines: 5137, 5154. EditorGUI.cs 5137
  • V3095 CWE-476 The 'exposedPropertyTable' object was used before it was verified against null. Check lines: 152, 154. ExposedReferenceDrawer.cs 152
  • V3095 CWE-476 The 'rectObjs' object was used before it was verified against null. Check lines: 97, 99. RectSelection.cs 97
  • And 7 additional diagnostic messages.

Infer.NET

V3095 The 'quantiles' object was used before it was verified against null. Check lines: 91, 92. Runtime OuterQuantiles.cs 91


public static double GetQuantile(double probability,
                                 double[] quantiles)
{
  ....
  int n = quantiles.Length;
  if (quantiles == null)
    throw new ArgumentNullException(nameof(quantiles));
  if (n == 0)
    throw new ArgumentException("quantiles array is empty", nameof(quantiles));
  ....
}

AWS SDK for .NET

V3095 [CWE-476] The 'conditionValues' object was used before it was verified against null. Check lines: 228, 238. AWSSDK.Core.Net45 JsonPolicyWriter.cs 228


private static void writeConditions(....)
{
  ....
  foreach (....)
  {
    IList<string> conditionValues = keyEntry.Value;
    if (conditionValues.Count == 0) // <=
      continue;
    ....
    if (conditionValues != null && conditionValues.Count != 0)
    {
      ....
    }
    ....
  }
}

Similar errors can be found in some other places:

  • V3095 [CWE-476] The 'ts.Listeners' object was used before it was verified against null. Check lines: 140, 143. AWSSDK.Core.Net45 Logger.Diagnostic.cs 140
  • V3095 [CWE-476] The 'obj' object was used before it was verified against null. Check lines: 743, 745. AWSSDK.Core.Net45 JsonMapper.cs 743
  • V3095 [CWE-476] The 'multipartUploadMultipartUploadpartsList' object was used before it was verified against null. Check lines: 65, 67. AWSSDK.S3.Net45 CompleteMultipartUploadRequestMarshaller.cs 65

.NET Core Libraries (CoreFX)

V3095 The 'context' object was used before it was verified against null. Check lines: 340, 346. Principal.cs 340


abstract public class Principal : IDisposable
{
  ....
  public void Save(PrincipalContext context)
  {
    ....

    if (   context.ContextType == ContextType.Machine  // <=
        || _ctx.ContextType == ContextType.Machine)
    {
      throw new InvalidOperationException(
        SR.SaveToNotSupportedAgainstMachineStore);
    }

    if (context == null)                               // <=
    {
      Debug.Assert(this.unpersisted == true);
      throw new InvalidOperationException(SR.NullArguments);
    }
    ....
  }
  ....
}

.NET Core Libraries (CoreFX)

V3095 The 'propertyNames' object was used before it was verified against null. Check lines: 990, 1004. DirectoryEntry.cs 990


public class DirectoryEntry : Component
{
  ....
  public void RefreshCache(string[] propertyNames)
  {
    ....
    object[] names = new object[propertyNames.Length];         // <=
    for (int i = 0; i < propertyNames.Length; i++)
      names[i] = propertyNames[i];
    ....
    if (_propertyCollection != null && propertyNames != null)  // <=
      ....
    ....
  }
  ....
}

.NET Core Libraries (CoreFX)

V3095 The 'outputStream' object was used before it was verified against null. Check lines: 654, 672. Icon.Windows.cs 654


public sealed partial class Icon :
  MarshalByRefObject, ICloneable, IDisposable, ISerializable
{
  ....
  public void Save(Stream outputStream)
  {
    if (_iconData != null)
    {
      outputStream.Write(_iconData, 0, _iconData.Length); // <=
    }
    else
    {
      ....
      if (outputStream == null)                           // <=
        throw new ArgumentNullException("dataStream");
      ....
    }
  }
  ....
}

.NET Core Libraries (CoreFX)

V3095 The 'seq' object was used before it was verified against null. Check lines: 880, 884. XmlQueryRuntime.cs 880


public IList<XPathNavigator> DocOrderDistinct(IList<XPathNavigator> seq)
{
  if (seq.Count <= 1) // <=
    return seq;

  XmlQueryNodeSequence nodeSeq = (XmlQueryNodeSequence)seq; // <=
  if (nodeSeq == null) // <=
    nodeSeq = new XmlQueryNodeSequence(seq);

  return nodeSeq.DocOrderDistinct(_docOrderCmp);
}

.NET Core Libraries (CoreFX)

V3095 The 'other' object was used before it was verified against null. Check lines: 1095, 1096. XPathNodePointer.cs 1095


internal XmlNodeOrder ComparePosition(XPathNodePointer other)
{
  RealFoliate();
  other.RealFoliate();
  Debug.Assert(other != null);
  ....
}

.NET Core Libraries (CoreFX)

V3095 The 'buffer' object was used before it was verified against null. Check lines: 51, 53. HttpRequestStream.cs 51


public override IAsyncResult BeginRead(byte[] buffer, ....)
{
  if (NetEventSource.IsEnabled)
  {
    NetEventSource.Enter(this);
    NetEventSource.Info(this,
                        "buffer.Length:" + buffer.Length +  // <=
                        " size:" + size +
                        " offset:" + offset);
  }
  if (buffer == null) // <=
  {
    throw new ArgumentNullException(nameof(buffer));
  }
  ....
}

Similar errors can be found in some other places:

  • V3095 The 'buffer' object was used before it was verified against null. Check lines: 49, 51. HttpResponseStream.cs 49
  • V3095 The 'buffer' object was used before it was verified against null. Check lines: 74, 75. HttpResponseStream.cs 74

.NET Core Libraries (CoreFX)

V3095 The 'tx' object was used before it was verified against null. Check lines: 3282, 3285. TransactionState.cs 3282


internal override void EnterState(InternalTransaction tx)
{
  if (tx._outcomeSource._isoLevel == IsolationLevel.Snapshot) // <=
  {
    throw TransactionException.CreateInvalidOperationException(
            ....,
            tx == null ? Guid.Empty : tx.DistributedTxId);   // <=
  }
  ....
}

Roslyn Analyzers

V3095 The 'rule' object was used before it was verified against null. Check lines: 2180, 2181. CodeFixProvider.cs 2180


internal static string GetFirstRuleName(ClassDeclarationSyntax declaration)
{
  SyntaxList<MemberDeclarationSyntax> members = declaration.Members;
  FieldDeclarationSyntax rule = null;

  foreach (MemberDeclarationSyntax member in members)
  {
     rule = member as FieldDeclarationSyntax;
     var ruleType = rule.Declaration.Type as IdentifierNameSyntax;
     if (rule != null
         && ruleType != null
         && ruleType.Identifier.Text == "DiagnosticDescriptor")
       {break;}
     rule = null;
  }
  ....
}

ShareX

V3095 [CWE-476] The 'pi' object was used before it was verified against null. Check lines: 801, 803. ImageHelpers.cs 801


public static bool AddMetadata(Image img, int id, string text)
{
  ....
  pi.Value = bytesText; // <=

  if (pi != null)
  {
    img.SetPropertyItem(pi);
    return true;
  }
  ....
}

ShareX

V3095 [CWE-476] The 'task' object was used before it was verified against null. Check lines: 268, 270. TaskManager.cs 268


private static void Task_TaskCompleted(WorkerTask task)
{
  ....
  task.KeepImage = false; // <=

  if (task != null)
  {
    if (task.RequestSettingUpdate)
    {
      Program.MainForm.UpdateCheckStates();
    }
    ....
  }
  ....
}

Similar errors can be found in some other places:

  • V3095 [CWE-476] The 'Config.PhotobucketAccountInfo' object was used before it was verified against null. Check lines: 216, 219. UploadersConfigForm.cs 216

Azure PowerShell

V3095 The 'certificate' object was used before it was verified against null. Check lines: 41, 43. CertificateInfo.cs 41


public CertificateInfo(
  ....,
  Azure.Management.Automation.Models.Certificate certificate)
{
  ....
  this.Name = certificate.Name;

  if (certificate == null) return;
  ....
}

Similar errors can be found in some other places:

  • V3095 The 'clusterCred' object was used before it was verified against null. Check lines: 115, 118. InvokeHiveCommand.cs 115
  • V3095 The '_profile' object was used before it was verified against null. Check lines: 47, 49. RMProfileClient.cs 47
  • V3095 The 'this.LoadBalancer.BackendAddressPools' object was used before it was verified against null. Check lines: 56, 63. AddAzureRmLoadBalancerBackendAddressPoolConfigCommand.cs 56

Orchard CMS

V3095 The 'remoteClient' object was used before it was verified against null. Check lines: 49, 51. ImportRemoteInstanceController.cs 49


public async Task<IActionResult> Import(ImportViewModel model)
{
  ....
  var remoteClient = remoteClientList.RemoteClients.FirstOrDefault(....);
  var apiKey = Encoding.UTF8.GetString(....(remoteClient.ProtectedApiKey));
  if (remoteClient == null || ....)
  {
    ....
  }
  ....
}

Azure SDK for .NET

V3095 The 'httpRequest.Content.Headers' object was used before it was verified against null. Check lines: 76, 79. BatchSharedKeyCredential.cs 76


public override Task ProcessHttpRequestAsync(
  HttpRequestMessage httpRequest, ....)
{
  ....
  signature.Append(httpRequest.Content != null
    && httpRequest.Content.Headers.Contains("Content-Language") ? .... : ....;

  long? contentLength = httpRequest.Content?.Headers?.ContentLength;
  ....
}

osu!

V3095 [CWE-476] The 'columns' object was used before it was verified against null. Check lines: 141, 142. SquareGraph.cs 141


private void redrawProgress()
{
  for (int i = 0; i < ColumnCount; i++)
    columns[i].State = i <= progress ? ColumnState.Lit : ColumnState.Dimmed;
  columns?.ForceRedraw();
}

Chocolatey

V3095 [CWE-476] The 'installedPackage' object was used before it was verified against null. Check lines: 910, 917. NugetService.cs 910


public virtual ConcurrentDictionary<string, PackageResult> get_outdated(....)
{
  ....
  var pinnedPackageResult = outdatedPackages.GetOrAdd(
    packageName,
    new PackageResult(installedPackage,
                      _fileSystem.combine_paths(
                        ApplicationParameters.PackagesLocation,
                        installedPackage.Id)));
  ....
  if (   installedPackage != null
      && !string.IsNullOrWhiteSpace(installedPackage.Version.SpecialVersion)
      && !config.UpgradeCommand.ExcludePrerelease)
  {
    ....
  }
  ....
}

Nethermind

V3095 The '_logger' object was used before it was verified against null. Check lines: 118, 118. Nethermind.Wallet DevKeyStoreWallet.cs 118


public void Sign(Transaction tx, int chainId)
{
  if (_logger.IsDebug)
    _logger?.Debug($"Signing transaction: {tx.Value} to {tx.To}");
  IBasicWallet.Sign(this, tx, chainId);
}

Similar errors can be found in some other places:

  • V3095 The '_enode' object was used before it was verified against null. Check lines: 55, 56. Nethermind.JsonRpc AdminModule.cs 55

RavenDB

V3095 The 'node.Indexer' object was used before it was verified against null. Check lines: 1180, 1182. ExpressionStringBuilder.cs(1180), ExpressionStringBuilder.cs(1182) Raven.Client


protected override Expression VisitIndex(IndexExpression node)
{
  if (node.Object != null)
  {
    Visit(node.Object);
  }
  else
  {
    Out(node.Indexer.DeclaringType.Name); // <=
  }
  if (node.Indexer != null)               // <=
  {
    Out(".");
    Out(node.Indexer.Name);
  }
  VisitExpressions('[', node.Arguments, ']');
  return node;
}

ONLYOFFICE Community Server

V3095 The 'r.Attributes["href"]' object was used before it was verified against null. Check lines: 86, 87. HelpCenterStorage.cs 86


public override void Init(string html, string helpLinkBlock, string baseUrl)
{
    ....
    foreach (var href in hrefs.Where(r =>
    {
        var value = r.Attributes["href"].Value;
        return r.Attributes["href"] != null
               && !string.IsNullOrEmpty(value)
               && !value.StartsWith("mailto:")
               && !value.StartsWith("http");
    }))
    {
      ....
    }
    ....
}

ILSpy

V3095 The 'roslynProject' object was used before it was verified against null. Check lines: 96, 97. ILSpy.AddIn OpenILSpyCommand.cs 96


protected Dictionary<string, DetectedReference> GetReferences(....)
{
  ....
  var roslynProject =  owner.Workspace
                            .CurrentSolution
                            .GetProject(projectReference.ProjectId);
  var project = FindProject(owner.DTE.Solution
                                 .Projects.OfType<EnvDTE.Project>(),
                            roslynProject.FilePath);              // <=

  if (roslynProject != null && project != null)                   // <=
  ....
}

ILSpy

V3095 The 'listBox' object was used before it was verified against null. Check lines: 46, 52. ILSpy FlagsFilterControl.xaml.cs 46


public override void OnApplyTemplate()
{
  base.OnApplyTemplate();

  listBox = Template.FindName("ListBox", this) as ListBox;
  listBox.ItemsSource = FlagGroup.GetFlags(....);         // <=

  var filter = Filter;

  if (filter == null || filter.Mask == -1)
  {
    listBox?.SelectAll();                                 // <=
  }
}

Similar errors can be found in some other places:

  • V3095 The 'pV' object was used before it was verified against null. Check lines: 761, 765. ICSharpCode.Decompiler TypeInference.cs 761
  • V3095 The 'pU' object was used before it was verified against null. Check lines: 882, 886. ICSharpCode.Decompiler TypeInference.cs 882
  • V3095 The 'finalStore' object was used before it was verified against null. Check lines: 261, 262. ICSharpCode.Decompiler TransformArrayInitializers.cs 261
  • And 5 additional diagnostic messages.

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