linux-kernel - Re: [PATCH] perf c2c report: Fix crash for empty browser

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Message-ID: <20180726193046.GC20438@kernel.org>
Date:   Thu, 26 Jul 2018 16:30:46 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>, rodia@...istici.org
Subject: Re: [PATCH] perf c2c report: Fix crash for empty browser

Em Tue, Jul 24, 2018 at 08:20:08AM +0200, Jiri Olsa escreveu:
> Do not try to display entry details if there's
> not any. Currently this ends up in crash:
>   $ perf c2c report
>   perf: Segmentation fault

How to replicate this?

I tried:

$ perf record sleep 1
$ perf c2c report

But it didn't segfault

 
> Reported-by: rodia@...istici.org
> Link: http://lkml.kernel.org/n/tip-3d7qjz9x49ay9ncerfordcv3@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
>  tools/perf/builtin-c2c.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
> index f2ea85ee573f..f3aa9d02a5ab 100644
> --- a/tools/perf/builtin-c2c.c
> +++ b/tools/perf/builtin-c2c.c
> @@ -2349,6 +2349,9 @@ static int perf_c2c__browse_cacheline(struct hist_entry *he)
>  	" s             Toggle full length of symbol and source line columns \n"
>  	" q             Return back to cacheline list \n";
>  
> +	if (!he)
> +		return 0;
> +
>  	/* Display compact version first. */
>  	c2c.symbol_full = false;
>  
> -- 
> 2.17.1