linux-kernel - Re: [PATCH 5/7] perf hists browser: Fix possible memory leak

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Date:	Mon, 20 Apr 2015 10:24:15 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 5/7] perf hists browser: Fix possible memory leak

On Sun, Apr 19, 2015 at 01:04:13PM +0900, Namhyung Kim wrote:
> The options array saves strings for each popup menu item.  The number of
> items can be vary according to the currently selected item.  So it can
> leak some memory if it's exited from a small item.  Fix it by freeing
> all items when loop terminates.
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/ui/browsers/hists.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/ui/browsers/hists.c b/tools/perf/ui/browsers/hists.c
> index 8f303eb5044d..cace2df7e561 100644
> --- a/tools/perf/ui/browsers/hists.c
> +++ b/tools/perf/ui/browsers/hists.c
> @@ -1691,7 +1691,8 @@ skip_annotation:
>  				"Switch to another data file in PWD") > 0)
>  			switch_data = nr_options++;
>  add_exit_option:
> -		options[nr_options++] = (char *)"Exit";
> +		if (asprintf(&options[nr_options], "Exit") > 0)
> +			nr_options++;

this one could cause segfault right? nice catch

>  retry_popup_menu:
>  		choice = ui__popup_menu(nr_options, options);
>  
> @@ -1812,7 +1813,7 @@ out_free_stack:
>  	pstack__delete(fstack);
>  out:
>  	hist_browser__delete(browser);
> -	free_popup_options(options, nr_options - 1);
> +	free_popup_options(options, ARRAY_SIZE(options));
>  	return key;
>  }
>  
> -- 
> 2.3.5
> 
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