linux-kernel - Re: [PATCH v1] perf vdso: Missed put on 32-bit dsos

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Message-ID: <ZuM9zc71XXXZ3eRZ@x1>
Date: Thu, 12 Sep 2024 16:15:25 -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-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf vdso: Missed put on 32-bit dsos

On Thu, Sep 12, 2024 at 11:27:57AM -0700, Ian Rogers wrote:
> If the dso type doesn't match then NULL is returned but the dso should
> be put first.

I guess we can add:

Fixes: f649ed80f3cabbf1 ("perf dsos: Tidy reference counting and locking")

?

- Arnaldo
 
> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/util/vdso.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/vdso.c b/tools/perf/util/vdso.c
> index 1b6f8f6db7aa..c12f5d8c4bf6 100644
> --- a/tools/perf/util/vdso.c
> +++ b/tools/perf/util/vdso.c
> @@ -308,8 +308,10 @@ static struct dso *machine__find_vdso(struct machine *machine,
>  		if (!dso) {
>  			dso = dsos__find(&machine->dsos, DSO__NAME_VDSO,
>  					 true);
> -			if (dso && dso_type != dso__type(dso, machine))
> +			if (dso && dso_type != dso__type(dso, machine)) {
> +				dso__put(dso);
>  				dso = NULL;
> +			}
>  		}
>  		break;
>  	case DSO__TYPE_X32BIT:
> -- 
> 2.46.0.662.g92d0881bb0-goog