linux-kernel - Re: [PATCH v1 02/11] perf stat: Smatch: Fix use-after-freed pointer

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Message-ID: <20190703181841.GC10740@kernel.org>
Date:   Wed, 3 Jul 2019 15:18:41 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Andi Kleen <ak@...ux.intel.com>,
        "David S. Miller" <davem@...emloft.net>,
        Davidlohr Bueso <dave@...olabs.net>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Song Liu <songliubraving@...com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexios Zavras <alexios.zavras@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Changbin Du <changbin.du@...el.com>,
        Eric Saint-Etienne <eric.saint.etienne@...cle.com>,
        Konstantin Khlebnikov <khlebnikov@...dex-team.ru>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Alexey Budankov <alexey.budankov@...ux.intel.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v1 02/11] perf stat: Smatch: Fix use-after-freed pointer

Em Tue, Jul 02, 2019 at 06:34:11PM +0800, Leo Yan escreveu:
> Based on the following report from Smatch, fix the use-after-freed
> pointer.
> 
>   tools/perf/builtin-stat.c:1353
>   add_default_attributes() warn: passing freed memory 'str'.
> 
> The pointer 'str' has been freed but later it is still passed into the
> function parse_events_print_error().  This patch fixes this
> use-after-freed issue.

thanks, applied.
 
> Signed-off-by: Leo Yan <leo.yan@...aro.org>
> ---
>  tools/perf/builtin-stat.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index 8a35fc5a7281..de0f6d0e96a2 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -1349,8 +1349,8 @@ static int add_default_attributes(void)
>  				fprintf(stderr,
>  					"Cannot set up top down events %s: %d\n",
>  					str, err);
> -				free(str);
>  				parse_events_print_error(&errinfo, str);
> +				free(str);
>  				return -1;
>  			}
>  		} else {
> -- 
> 2.17.1

-- 

- Arnaldo