fix: possible null pointer dereference

[rng70-or]

In file: LinkCommandLine.java, class LinkCommandLine there is a method addDynamicInputLinkOptions that, there is a potential Null pointer dereference while calling the equals method.

PathFragment libDir = inputArtifact.getExecPath().getParentDirectory();

The method getParentDirectory() can return null value.

public PathFragment getParentDirectory() {
    return segments.length == 0 ? null : subFragment(0, segments.length - 1);
}

now if the returned value is null then it later can raise a NullPointerException

!libDir.equals(solibDir)

but changing the order it can be avoided or a null check on libDir should be done to avoid this kind error. like

!solibDir.equals(libDir)

or

libDir != null

Sponsorship and Support

This work is done by the security researchers from OpenRefactory and is supported by the Open Source Security Foundation (OpenSSF): Project Alpha-Omega. Alpha-Omega is a project partnering with open source software project maintainers to systematically find new, as-yet-undiscovered vulnerabilities in open source code - and get them fixed – to improve global software supply chain security.

The bug is found by running the Intelligent Code Repair (iCR) tool by OpenRefactory and then manually triaging the results.