linux-kernel - Re: [PATCH 1/1] perf probe: Free string returned by synthesize_perf_probe_point() on failure in synthesize_perf_probe

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Date:   Thu, 10 Aug 2023 14:57:30 -0700
From:   Ian Rogers <irogers@...gle.com>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Masami Hiramatsu <mhiramat@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] perf probe: Free string returned by
 synthesize_perf_probe_point() on failure in synthesize_perf_probe_command()

On Fri, Aug 4, 2023 at 9:27 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
>
> Building perf with EXTRA_CFLAGS="-fsanitize=address" a leak was detected
> elsewhere and lead to an audit, where we found that
> synthesize_perf_probe_command() may leak synthesize_perf_probe_point()
> return on failure, fix it.
>
> Cc: Adrian Hunter <adrian.hunter@...el.com>
> Cc: Ian Rogers <irogers@...gle.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Masami Hiramatsu <mhiramat@...nel.org>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Link: https://lore.kernel.org/lkml/
> Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>

Reviewed-by: Ian Rogers <irogers@...gle.com>

Thanks,
Ian

> ---
>  tools/perf/util/probe-event.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
> index c7bfeab610a3679a..2835d87cb97771f9 100644
> --- a/tools/perf/util/probe-event.c
> +++ b/tools/perf/util/probe-event.c
> @@ -2063,14 +2063,18 @@ char *synthesize_perf_probe_command(struct perf_probe_event *pev)
>                         goto out;
>
>         tmp = synthesize_perf_probe_point(&pev->point);
> -       if (!tmp || strbuf_addstr(&buf, tmp) < 0)
> +       if (!tmp || strbuf_addstr(&buf, tmp) < 0) {
> +               free(tmp);
>                 goto out;
> +       }
>         free(tmp);
>
>         for (i = 0; i < pev->nargs; i++) {
>                 tmp = synthesize_perf_probe_arg(pev->args + i);
> -               if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0)
> +               if (!tmp || strbuf_addf(&buf, " %s", tmp) < 0) {
> +                       free(tmp);
>                         goto out;
> +               }
>                 free(tmp);
>         }
>
> --
> 2.37.1
>