linux-kernel - Re: [PATCH v2 3/9] perf tools: ensure config and str in terms are unique

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Message-ID: <20191023085045.GE22919@krava>
Date:   Wed, 23 Oct 2019 10:50:45 +0200
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 v2 3/9] perf tools: ensure config and str in terms are
 unique

On Tue, Oct 22, 2019 at 05:53:31PM -0700, Ian Rogers wrote:

SNIP

>  					return -1;
> +				}
>  				list_add_tail(&term->list, head);
>  
>  				if (!parse_events_add_pmu(parse_state, list,
>  							  pmu->name, head,
>  							  true, true)) {
> -					pr_debug("%s -> %s/%s/\n", str,
> +					pr_debug("%s -> %s/%s/\n", config,
>  						 pmu->name, alias->str);
>  					ok++;
>  				}
> @@ -1462,8 +1472,10 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
>  			}
>  		}
>  	}
> -	if (!ok)
> +	if (!ok) {
> +		free(list);
>  		return -1;
> +	}
>  	*listp = list;
>  	return 0;
>  }
> @@ -2761,13 +2773,13 @@ int parse_events_term__sym_hw(struct parse_events_term **term,
>  	struct parse_events_term temp = {
>  		.type_val  = PARSE_EVENTS__TERM_TYPE_STR,
>  		.type_term = PARSE_EVENTS__TERM_TYPE_USER,
> -		.config    = config ?: (char *) "event",
> +		.config    = config ?: strdup("event"),

there's no check if this succeeds

>  	};
>  
>  	BUG_ON(idx >= PERF_COUNT_HW_MAX);
>  	sym = &event_symbols_hw[idx];
>  
> -	return new_term(term, &temp, (char *) sym->symbol, 0);
> +	return new_term(term, &temp, strdup(sym->symbol), 0);
>  }
>  
>  int parse_events_term__clone(struct parse_events_term **new,
> @@ -2776,12 +2788,15 @@ int parse_events_term__clone(struct parse_events_term **new,
>  	struct parse_events_term temp = {
>  		.type_val  = term->type_val,
>  		.type_term = term->type_term,
> -		.config    = term->config,
> +		.config    = term->config ? strdup(term->config) : NULL,

ditto

also how is this released when term is freed?

thanks,
jirka