linux-kernel - Re: [PATCH] perf, script: Fix crash with printing mixed trace point and other events

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Date:   Fri, 18 Jan 2019 10:49:19 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] perf, script: Fix crash with printing mixed trace point
 and other events

On Thu, Jan 17, 2019 at 11:48:34AM -0800, Andi Kleen wrote:
> From: Andi Kleen <ak@...ux.intel.com>
> 
> perf script crashes currently when printing mixed trace points and other
> events because the trace format does not handle events without trace
> meta data. Add a simple check to avoid that.
> 
> % cat > test.c
> main()
> {
>     printf("Hello world\n");
> }
> ^D
> % gcc -g -o test test.c
> % sudo perf probe -x test 'test.c:3'
> % perf record -e '{cpu/cpu-cycles,period=10000/,probe_test:main}:S' ./test
> % perf script
> <segfault>
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>

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

thanks,
jirka

> ---
>  tools/perf/builtin-script.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 3728b50e52e2..ea2396b33a57 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -1779,7 +1779,7 @@ static void process_event(struct perf_script *script,
>  		return;
>  	}
>  
> -	if (PRINT_FIELD(TRACE)) {
> +	if (PRINT_FIELD(TRACE) && sample->raw_data) {
>  		event_format__fprintf(evsel->tp_format, sample->cpu,
>  				      sample->raw_data, sample->raw_size, fp);
>  	}
> -- 
> 2.17.2
>