Skip to content

Potential fix for code scanning alert no. 4: Missed opportunity to use Where #339

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
merged 1 commit into from
Mar 11, 2025

Conversation

krishnprakash
Copy link
Owner

Potential fix for https://github.com/krishnprakash/codeql/security/code-scanning/4

To fix the problem, we need to replace the foreach loop that implicitly filters its target sequence with a foreach loop that explicitly filters the sequence using the Where method. This change will make the code more readable and maintainable.

  • Replace the foreach loop on line 28 with a foreach loop that uses the Where method to filter the sequence.
  • Ensure that the filtering condition attributeData.ApplicationSyntaxReference?.GetSyntax() is SyntaxNode syntax is moved to the Where method.

Suggested fixes powered by Copilot Autofix. Review carefully before merging.

…e Where

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>
Signed-off-by: Phileco <[email protected]>
@github-actions github-actions bot added the C# label Mar 11, 2025
@@ -25,10 +25,10 @@
attributeLookup = new Lazy<Func<SyntaxNode, AttributeData?>>(() =>
{
var dict = new Dictionary<SyntaxNode, AttributeData?>();
foreach (var attributeData in cx.Compilation.Assembly.GetAttributes().Concat(cx.Compilation.Assembly.Modules.SelectMany(m => m.GetAttributes())))
foreach (var attributeData in cx.Compilation.Assembly.GetAttributes().Concat(cx.Compilation.Assembly.Modules.SelectMany(m => m.GetAttributes())).Where(attributeData => attributeData.ApplicationSyntaxReference?.GetSyntax() is SyntaxNode syntax))

Check warning

Code scanning / CodeQL

Useless assignment to local variable Warning

This assignment to
syntax
is useless, since its value is never read.

Copilot Autofix

AI about 1 month ago

To fix the problem, we need to remove the unnecessary assignment to the syntax variable. This can be done by simply deleting the line where the assignment occurs. This change will not affect the existing functionality of the code.

Suggested changeset 1
csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs b/csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs
--- a/csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs
+++ b/csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs
@@ -27,3 +27,3 @@
                     var dict = new Dictionary<SyntaxNode, AttributeData?>();
-                    foreach (var attributeData in cx.Compilation.Assembly.GetAttributes().Concat(cx.Compilation.Assembly.Modules.SelectMany(m => m.GetAttributes())).Where(attributeData => attributeData.ApplicationSyntaxReference?.GetSyntax() is SyntaxNode syntax))
+                    foreach (var attributeData in cx.Compilation.Assembly.GetAttributes().Concat(cx.Compilation.Assembly.Modules.SelectMany(m => m.GetAttributes())).Where(attributeData => attributeData.ApplicationSyntaxReference?.GetSyntax() is SyntaxNode))
                     {
EOF
@@ -27,3 +27,3 @@
var dict = new Dictionary<SyntaxNode, AttributeData?>();
foreach (var attributeData in cx.Compilation.Assembly.GetAttributes().Concat(cx.Compilation.Assembly.Modules.SelectMany(m => m.GetAttributes())).Where(attributeData => attributeData.ApplicationSyntaxReference?.GetSyntax() is SyntaxNode syntax))
foreach (var attributeData in cx.Compilation.Assembly.GetAttributes().Concat(cx.Compilation.Assembly.Modules.SelectMany(m => m.GetAttributes())).Where(attributeData => attributeData.ApplicationSyntaxReference?.GetSyntax() is SyntaxNode))
{
Copilot is powered by AI and may make mistakes. Always verify output.
{
if (attributeData.ApplicationSyntaxReference?.GetSyntax() is SyntaxNode syntax)
dict.Add(syntax, attributeData);
var syntax = attributeData.ApplicationSyntaxReference?.GetSyntax() as SyntaxNode;

Check warning

Code scanning / CodeQL

Cast to same type Warning

This cast is redundant because the expression already has type SyntaxNode.

Copilot Autofix

AI about 1 month ago

To fix the problem, we need to remove the redundant cast from the expression attributeData.ApplicationSyntaxReference?.GetSyntax() as SyntaxNode. This can be done by simply using the expression attributeData.ApplicationSyntaxReference?.GetSyntax() directly, as it already returns a SyntaxNode.

  • Locate the line with the redundant cast in the file csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs.
  • Remove the as SyntaxNode cast from the expression.
  • Ensure that the functionality remains unchanged.
Suggested changeset 1
csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs

Autofix patch

Autofix patch
Run the following command in your local git repository to apply this patch
cat << 'EOF' | git apply
diff --git a/csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs b/csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs
--- a/csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs
+++ b/csharp/extractor/Semmle.Extraction.CSharp/Populators/TypeContainerVisitor.cs
@@ -29,3 +29,3 @@
                     {
-                        var syntax = attributeData.ApplicationSyntaxReference?.GetSyntax() as SyntaxNode;
+                        var syntax = attributeData.ApplicationSyntaxReference?.GetSyntax();
                         dict.Add(syntax, attributeData);
EOF
@@ -29,3 +29,3 @@
{
var syntax = attributeData.ApplicationSyntaxReference?.GetSyntax() as SyntaxNode;
var syntax = attributeData.ApplicationSyntaxReference?.GetSyntax();
dict.Add(syntax, attributeData);
Copilot is powered by AI and may make mistakes. Always verify output.
@krishnprakash krishnprakash marked this pull request as ready for review March 11, 2025 09:49
@krishnprakash krishnprakash merged commit 775b3eb into main Mar 11, 2025
6 of 7 checks passed
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Labels
Projects
None yet
Development

Successfully merging this pull request may close these issues.

1 participant