linux-kernel - Re: [PATCH] perf util: Fix use after free in metric_

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Date:   Wed, 8 Dec 2021 09:33:14 -0800
From:   Ian Rogers <irogers@...gle.com>
To:     José Expósito <jose.exposito89@...il.com>
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        mark.rutland@....com, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org, ak@...ux.intel.com,
        john.garry@...wei.com, linux-perf-users@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf util: Fix use after free in metric__new

On Wed, Dec 8, 2021 at 9:11 AM José Expósito <jose.exposito89@...il.com> wrote:
>
> Addresses-Coverity-ID: 1494000
> Signed-off-by: José Expósito <jose.exposito89@...il.com>

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

This can only happen in the ENOMEM case, but it is a good fix.

Fixes: b85a4d61d302 (perf metric: Allow modifiers on metrics)

Thanks,
Ian

> ---
>  tools/perf/util/metricgroup.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/metricgroup.c b/tools/perf/util/metricgroup.c
> index fffe02aae3ed..4d2fed3aefd1 100644
> --- a/tools/perf/util/metricgroup.c
> +++ b/tools/perf/util/metricgroup.c
> @@ -209,8 +209,8 @@ static struct metric *metric__new(const struct pmu_event *pe,
>         m->metric_name = pe->metric_name;
>         m->modifier = modifier ? strdup(modifier) : NULL;
>         if (modifier && !m->modifier) {
> -               free(m);
>                 expr__ctx_free(m->pctx);
> +               free(m);
>                 return NULL;
>         }
>         m->metric_expr = pe->metric_expr;
> --
> 2.25.1
>