linux-kernel - Re: [PATCH v6 3/6] tracing: Update synth command errors

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Message-ID: <20210122160600.409936d8@gandalf.local.home>
Date:   Fri, 22 Jan 2021 16:06:00 -0500
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Tom Zanussi <zanussi@...nel.org>
Cc:     axelrasmussen@...gle.com, mhiramat@...nel.org,
        dan.carpenter@...cle.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 3/6] tracing: Update synth command errors

On Thu, 21 Jan 2021 11:01:06 -0600
Tom Zanussi <zanussi@...nel.org> wrote:

> +static int check_command(const char *raw_command)
> +{
> +	char **argv = NULL, *cmd, *saved_cmd, *name_and_field;
> +	int argc, ret = 0;
> +
> +	cmd = saved_cmd = kstrdup(raw_command, GFP_KERNEL);
> +	if (!cmd)
> +		return -ENOMEM;
> +
> +	name_and_field = strsep(&cmd, ";");
> +	if (!name_and_field) {
> +		ret = -EINVAL;
> +		goto free;
> +	}
> +
> +	if (name_and_field[0] == '!')
> +		goto free;
> +
> +	argv = argv_split(GFP_KERNEL, name_and_field, &argc);
> +	if (!argv) {
> +		ret = -ENOMEM;
> +		goto free;
> +	}
> +
> +	if (argc < 3)
> +		ret = -EINVAL;

Nit, you can simply put here:

	argv_free(argv);

Hmm, is it used at all? If not, just move it after its allocation check.

> +free:
> +	kfree(saved_cmd);

> +	if (argv)
> +		argv_free(argv);

And remove the above, as argv is always NULL when "goto free" is used.

-- Steve


> +
> +	return ret;
> +}
> +