Our SAST shows possible NullPointerException in https://github.com/jruby/jruby/blob/master/core/src/main/java/org/jruby/util/io/PopenExecutor.java#L567

    private RubyIO pipeOpen(ThreadContext context, ExecArg eargp, String modestr, int fmode, IOEncodable convconfig) {
        final Ruby runtime = context.runtime;
        IRubyObject prog = eargp != null ? (eargp.use_shell ? eargp.command_name : eargp.command_name) : null;

...

        if (eargp.chdirGiven) {

If eargp can be null, as stated earlier, then it will cause NullPointerException at eargp.chdirGiven

Environment Information

We are analyzing versions 9.4.x (8-12), but this problem is still in master

Expected Behavior

• No NPE at all. But it seems nobody catch it through the years, so i don't know if this arg may hold null at all

Actual Behavior

• I have no tests to show this NPE, can't figure out how to make one. This is simply code analysis, that showed possible NPE