linux-kernel - Re: [PATCH urgent] perf data: Fix double free in perf_session_

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Date:   Sun, 20 Feb 2022 23:46:15 +0100
From:   Jiri Olsa <olsajiri@...il.com>
To:     Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Antonov <alexander.antonov@...ux.intel.com>,
        Alexei Budankov <abudankov@...wei.com>
Subject: Re: [PATCH urgent] perf data: Fix double free in perf_session__delete

On Fri, Feb 18, 2022 at 06:23:41PM +0300, Alexey Bayduraev wrote:
> When perf_data__create_dir fails, it calls close_dir, but
> perf_session__delete also calls close_dir and since dir.version and
> dir.nr was initialized by perf_data__create_dir, a double free occurs.
> This patch moves the initialization of dir.version and dir.nr after
> successful initialization of dir.files, that prevents double freeing.
> This behavior is already implemented in perf_data__open_dir.
> 
> Fixes: 145520631130bd64 ("perf data: Add perf_data__(create_dir|close_dir) functions")
> Signed-off-by: Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>

Acked-by: Jiri Olsa <jolsa@...nel.org>

thanks,
jirka

> ---
>  tools/perf/util/data.c | 7 +++----
>  1 file changed, 3 insertions(+), 4 deletions(-)
> 
> diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> index f5d260b1df4d..15a4547d608e 100644
> --- a/tools/perf/util/data.c
> +++ b/tools/perf/util/data.c
> @@ -44,10 +44,6 @@ int perf_data__create_dir(struct perf_data *data, int nr)
>  	if (!files)
>  		return -ENOMEM;
>  
> -	data->dir.version = PERF_DIR_VERSION;
> -	data->dir.files   = files;
> -	data->dir.nr      = nr;
> -
>  	for (i = 0; i < nr; i++) {
>  		struct perf_data_file *file = &files[i];
>  
> @@ -62,6 +58,9 @@ int perf_data__create_dir(struct perf_data *data, int nr)
>  		file->fd = ret;
>  	}
>  
> +	data->dir.version = PERF_DIR_VERSION;
> +	data->dir.files   = files;
> +	data->dir.nr      = nr;
>  	return 0;
>  
>  out_err:
> -- 
> 2.19.0
>