linux-kernel - Re: [PATCH v2 13/18] perf svghelper: Avoid memory leak

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Date:   Sun, 8 Oct 2023 23:31:01 -0700
From:   Namhyung Kim <namhyung@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...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>,
        Yicong Yang <yangyicong@...ilicon.com>,
        Jonathan Cameron <jonathan.cameron@...wei.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Ming Wang <wangming01@...ngson.cn>,
        Huacai Chen <chenhuacai@...nel.org>,
        Sean Christopherson <seanjc@...gle.com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Yanteng Si <siyanteng@...ngson.cn>,
        Yuan Can <yuancan@...wei.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        James Clark <james.clark@....com>, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org
Subject: Re: [PATCH v2 13/18] perf svghelper: Avoid memory leak

On Thu, Oct 5, 2023 at 4:09 PM Ian Rogers <irogers@...gle.com> wrote:
>
> On success path the sib_core and sib_thr values weren't being
> freed. Detected by clang-tidy.
>
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/builtin-lock.c   | 1 +
>  tools/perf/util/svghelper.c | 5 +++--
>  2 files changed, 4 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
> index d4b22313e5fc..1b40b00c9563 100644
> --- a/tools/perf/builtin-lock.c
> +++ b/tools/perf/builtin-lock.c
> @@ -2463,6 +2463,7 @@ static int parse_call_stack(const struct option *opt __maybe_unused, const char
>                 entry = malloc(sizeof(*entry) + strlen(tok) + 1);
>                 if (entry == NULL) {
>                         pr_err("Memory allocation failure\n");
> +                       free(s);
>                         return -1;
>                 }
>

This is unrelated.  Please put it in a separate patch.

Thanks,
Namhyung


> diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
> index 0e4dc31c6c9c..1892e9b6aa7f 100644
> --- a/tools/perf/util/svghelper.c
> +++ b/tools/perf/util/svghelper.c
> @@ -754,6 +754,7 @@ int svg_build_topology_map(struct perf_env *env)
>         int i, nr_cpus;
>         struct topology t;
>         char *sib_core, *sib_thr;
> +       int ret = -1;
>
>         nr_cpus = min(env->nr_cpus_online, MAX_NR_CPUS);
>
> @@ -799,11 +800,11 @@ int svg_build_topology_map(struct perf_env *env)
>
>         scan_core_topology(topology_map, &t, nr_cpus);
>
> -       return 0;
> +       ret = 0;
>
>  exit:
>         zfree(&t.sib_core);
>         zfree(&t.sib_thr);
>
> -       return -1;
> +       return ret;
>  }
> --
> 2.42.0.609.gbb76f46606-goog
>