linux-kernel - Re: [PATCH v5 01/10] perf tools: add parse events handle error

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Date:   Wed, 6 Nov 2019 15:06:50 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>,
        Song Liu <songliubraving@...com>, Yonghong Song <yhs@...com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        bpf@...r.kernel.org, clang-built-linux@...glegroups.com,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH v5 01/10] perf tools: add parse events handle error

On Wed, Oct 30, 2019 at 03:34:39PM -0700, Ian Rogers wrote:
> Parse event error handling may overwrite one error string with another
> creating memory leaks. Introduce a helper routine that warns about
> multiple error messages as well as avoiding the memory leak.
> 
> A reproduction of this problem can be seen with:
>   perf stat -e c/c/
> After this change this produces:
> WARNING: multiple event parsing errors
> event syntax error: 'c/c/'
>                        \___ unknown term
> 
> valid terms: event,filter_rem,filter_opc0,edge,filter_isoc,filter_tid,filter_loc,filter_nc,inv,umask,filter_opc1,tid_en,thresh,filter_all_op,filter_not_nm,filter_state,filter_nm,config,config1,config2,name,period,percore
> Run 'perf list' for a list of valid events
> 
>  Usage: perf stat [<options>] [<command>]
> 
>     -e, --event <event>   event selector. use 'perf list' to list available events
> 
> Signed-off-by: Ian Rogers <irogers@...gle.com>

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

thanks,
jirka