CommandInfo.ResolveParameter throws NullReferenceException sometimes

From PowerShell/PSScriptAnalyzer#1538.

PSScriptAnalyzer tries to get the value of Export-ModuleMember's parameters by calling the CommandInfo.ResolveParameter() call here.

This calls into PowerShell here:

PowerShell/src/System.Management.Automation/engine/CommandInfo.cs

Lines 593 to 605 in b1e9980

    
           /// <summary> 
        
           /// Resolves a full, shortened, or aliased parameter name to the actual 
        
           /// cmdlet parameter name, using PowerShell's standard parameter resolution 
        
           /// algorithm. 
        
           /// </summary> 
        
           /// <param name="name">The name of the parameter to resolve.</param> 
        
           /// <returns>The parameter that matches this name.</returns> 
        
           public ParameterMetadata ResolveParameter(string name) 
        
           { 
        
               MergedCommandParameterMetadata merged = GetMergedCommandParameterMetadataSafely(); 
        
               MergedCompiledCommandParameter result = merged.GetMatchingParameter(name, true, true, null); 
        
               return this.Parameters[result.Parameter.Name]; 
        
           }

As with various other CommandInfo members, this appears not to be threadsafe and the call sometimes throws an NRE.

related: #12865

This issue has not had any activity in 6 months, if this is a bug please try to reproduce on the latest version of PowerShell and reopen a new issue and reference this issue if this is still a blocker for you.

This issue has been marked as "No Activity" as there has been no activity for 6 months. It has been closed for housekeeping purposes.

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CommandInfo.ResolveParameter throws NullReferenceException sometimes #13127

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	/// <summary>
	/// Resolves a full, shortened, or aliased parameter name to the actual
	/// cmdlet parameter name, using PowerShell's standard parameter resolution
	/// algorithm.
	/// </summary>
	/// <param name="name">The name of the parameter to resolve.</param>
	/// <returns>The parameter that matches this name.</returns>
	public ParameterMetadata ResolveParameter(string name)
	{
	MergedCommandParameterMetadata merged = GetMergedCommandParameterMetadataSafely();
	MergedCompiledCommandParameter result = merged.GetMatchingParameter(name, true, true, null);
	return this.Parameters[result.Parameter.Name];
	}

CommandInfo.ResolveParameter throws NullReferenceException sometimes #13127

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vexx32 commented on Jul 7, 2020

microsoft-github-policy-service commented on Nov 16, 2023

microsoft-github-policy-service commented on Nov 16, 2023

microsoft-github-policy-service commented on Nov 16, 2023

microsoft-github-policy-service commented on Nov 23, 2023

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