linux-kernel - Re: [PATCH v2] tools/perf/util: Fix memory leak in trace-event-info.c

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Date:	Mon, 14 Oct 2013 14:07:09 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Felipe Pena <felipensp@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Borislav Petkov <bp@...e.de>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] tools/perf/util: Fix memory leak in trace-event-info.c

Hi Felipe,

On Thu, 10 Oct 2013 22:21:29 -0300, Felipe Pena wrote:
> Fix for a memory leak on tracing_data_get() function when returning NULL explicitly
>
> Signed-off-by: Felipe Pena <felipensp@...il.com>
> ---
>  tools/perf/util/trace-event-info.c |    7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
> index f3c9e55..2a0c3c9 100644
> --- a/tools/perf/util/trace-event-info.c
> +++ b/tools/perf/util/trace-event-info.c
> @@ -518,13 +518,15 @@ struct tracing_data *tracing_data_get(struct list_head *pattrs,
>  			 "/tmp/perf-XXXXXX");
>  		if (!mkstemp(tdata->temp_file)) {
>  			pr_debug("Can't make temp file");
> -			return NULL;
> +			err = -1;
> +			goto err_tdata;
>  		}
>
>  		temp_fd = open(tdata->temp_file, O_RDWR);
>  		if (temp_fd < 0) {
>  			pr_debug("Can't read '%s'", tdata->temp_file);
> -			return NULL;
> +			err = -1;
> +			goto err_tdata;

I'd rather initialize err to -1 at the beginning.  And the malloc of
tdata should also be handled like this.

Thanks,
Namhyung


>  		}
>
>  		/*
> @@ -562,6 +564,7 @@ out:
>  		output_fd = fd;
>  	}
>
> +err_tdata:
>  	if (err) {
>  		free(tdata);
>  		tdata = NULL;
> --
> 1.7.10.4
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