linux-kernel - Re: [PATCH 1/2] perf annotate: Fix segfault on sample histogram

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Date: Fri, 10 May 2024 14:27:20 -0700
From: Ian Rogers <irogers@...gle.com>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>, Kan Liang <kan.liang@...ux.intel.com>, 
	Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>, 
	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...nel.org>, 
	LKML <linux-kernel@...r.kernel.org>, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/2] perf annotate: Fix segfault on sample histogram

On Fri, May 10, 2024 at 2:04 PM Namhyung Kim <namhyung@...nel.org> wrote:
>
> A symbol can have no samples, then accessing annotated_source->samples
> hashmap will get a segfault.
>
> Fixes: a3f7768bcf48 ("perf annotate: Fix memory leak in annotated_source")
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

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

Thanks,
Ian

> ---
>  tools/perf/util/annotate.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
>
> diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
> index 541988cf6e19..1451caf25e77 100644
> --- a/tools/perf/util/annotate.c
> +++ b/tools/perf/util/annotate.c
> @@ -113,10 +113,11 @@ static __maybe_unused void annotated_source__delete(struct annotated_source *src
>         if (src == NULL)
>                 return;
>
> -       hashmap__for_each_entry(src->samples, cur, bkt)
> -               zfree(&cur->pvalue);
> -
> -       hashmap__free(src->samples);
> +       if (src->samples) {
> +               hashmap__for_each_entry(src->samples, cur, bkt)
> +                       zfree(&cur->pvalue);
> +               hashmap__free(src->samples);
> +       }
>         zfree(&src->histograms);
>         free(src);
>  }
> --
> 2.45.0.118.g7fe29c98d7-goog
>