linux-kernel - Re: [PATCH v1] libsubcmd: Fix parse-options memory leak

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Date: Fri, 10 May 2024 11:17:00 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Kan Liang <kan.liang@...ux.intel.com>, linux-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v1] libsubcmd: Fix parse-options memory leak

On Wed, May 08, 2024 at 10:20:15PM -0700, Ian Rogers wrote:
> If a usage string is built in parse_options_subcommand, also free it.

Thanks, applied to perf-tools-next,

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/lib/subcmd/parse-options.c | 8 +++++---
>  1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/lib/subcmd/parse-options.c b/tools/lib/subcmd/parse-options.c
> index 9fa75943f2ed..d943d78b787e 100644
> --- a/tools/lib/subcmd/parse-options.c
> +++ b/tools/lib/subcmd/parse-options.c
> @@ -633,11 +633,10 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
>  			const char *const subcommands[], const char *usagestr[], int flags)
>  {
>  	struct parse_opt_ctx_t ctx;
> +	char *buf = NULL;
>  
>  	/* build usage string if it's not provided */
>  	if (subcommands && !usagestr[0]) {
> -		char *buf = NULL;
> -
>  		astrcatf(&buf, "%s %s [<options>] {", subcmd_config.exec_name, argv[0]);
>  
>  		for (int i = 0; subcommands[i]; i++) {
> @@ -679,7 +678,10 @@ int parse_options_subcommand(int argc, const char **argv, const struct option *o
>  			astrcatf(&error_buf, "unknown switch `%c'", *ctx.opt);
>  		usage_with_options(usagestr, options);
>  	}
> -
> +	if (buf) {
> +		usagestr[0] = NULL;
> +		free(buf);
> +	}
>  	return parse_options_end(&ctx);
>  }
>  
> -- 
> 2.45.0.rc1.225.g2a3ae87e7f-goog