linux-kernel - Re: [PATCH v1] perf parse: Avoid false uncore matches

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Date:   Fri, 17 Apr 2020 00:22:51 +0200
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 v1] perf parse: Avoid false uncore matches

On Thu, Apr 16, 2020 at 09:21:19AM -0700, Andi Kleen wrote:

SNIP

> ---
>  tools/perf/util/parse-events.y | 9 +++++++--
>  1 file changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/util/parse-events.y b/tools/perf/util/parse-events.y
> index 94f8bcd83582..f38c90756476 100644
> --- a/tools/perf/util/parse-events.y
> +++ b/tools/perf/util/parse-events.y
> @@ -286,7 +286,8 @@ PE_NAME opt_pmu_config
>  		parse_events_terms__delete(orig_terms);	\
>  		free(list);				\
>  		free($1);				\
> -		free(pattern);				\
> +		if ($1 != pattern)			\
> +			free(pattern);			\
>  		YYABORT;				\
>  	} while(0)
>  
> @@ -303,7 +304,9 @@ PE_NAME opt_pmu_config
>  		struct perf_pmu *pmu = NULL;
>  		int ok = 0;
>  
> -		if (asprintf(&pattern, "%s*", $1) < 0)
> +		if ($1[0] && isdigit($1[strlen($1) - 1]))
> +			pattern = $1;
> +		else if (asprintf(&pattern, "%s*", $1) < 0)
>  			CLEANUP_YYABORT;
>  
>  		while ((pmu = perf_pmu__scan(pmu)) != NULL) {
> @@ -320,6 +323,8 @@ PE_NAME opt_pmu_config
>  				parse_events_terms__delete(terms);
>  			}
>  		}
> +		if ($1 != pattern)
> +			free(pattern);

good catch

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

thanks,
jirka