linux-kernel - Re: [PATCH v1] perf tool x86: Fix perf

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Message-ID: <ZIkShy2yj1b0+GDv@kernel.org>
Date:   Tue, 13 Jun 2023 22:06:15 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1] perf tool x86: Fix perf_env memory leak

Em Tue, Jun 13, 2023 at 04:54:16PM -0700, Ian Rogers escreveu:
> Found by leak sanitizer:
> ```
> ==1632594==ERROR: LeakSanitizer: detected memory leaks
> 
> Direct leak of 21 byte(s) in 1 object(s) allocated from:
>     #0 0x7f2953a7077b in __interceptor_strdup ../../../../src/libsanitizer/asan/asan_interceptors.cpp:439
>     #1 0x556701d6fbbf in perf_env__read_cpuid util/env.c:369
>     #2 0x556701d70589 in perf_env__cpuid util/env.c:465
>     #3 0x55670204bba2 in x86__is_amd_cpu arch/x86/util/env.c:14
>     #4 0x5567020487a2 in arch__post_evsel_config arch/x86/util/evsel.c:83
>     #5 0x556701d8f78b in evsel__config util/evsel.c:1366
>     #6 0x556701ef5872 in evlist__config util/record.c:108
>     #7 0x556701cd6bcd in test__PERF_RECORD tests/perf-record.c:112
>     #8 0x556701cacd07 in run_test tests/builtin-test.c:236
>     #9 0x556701cacfac in test_and_print tests/builtin-test.c:265
>     #10 0x556701cadddb in __cmd_test tests/builtin-test.c:402
>     #11 0x556701caf2aa in cmd_test tests/builtin-test.c:559
>     #12 0x556701d3b557 in run_builtin tools/perf/perf.c:323
>     #13 0x556701d3bac8 in handle_internal_command tools/perf/perf.c:377
>     #14 0x556701d3be90 in run_argv tools/perf/perf.c:421
>     #15 0x556701d3c3f8 in main tools/perf/perf.c:537
>     #16 0x7f2952a46189 in __libc_start_call_main ../sysdeps/nptl/libc_start_call_main.h:58
> 
> SUMMARY: AddressSanitizer: 21 byte(s) leaked in 1 allocation(s).
> ```
> 
> Fixes: daea405f5f06 ("perf tool x86: Consolidate is_amd check into single function")

Its a fix, yes, but it is not for this daea405f5f06 patch, he just moved the
perf_mem_is_amd_cpu(), that was leaky, to a different file, the fixes is
for  for:

f7b58cbdb3ff36eb ("perf mem/c2c: Add load store event mappings for
AMD").

Right?

I'm fixing the fixes tag and applying the patch, thanks.

- Arnaldo

> Signed-off-by: Ian Rogers <irogers@...gle.com>
> ---
>  tools/perf/arch/x86/util/env.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/arch/x86/util/env.c b/tools/perf/arch/x86/util/env.c
> index 33b87f8ac1cc..3e537ffb1353 100644
> --- a/tools/perf/arch/x86/util/env.c
> +++ b/tools/perf/arch/x86/util/env.c
> @@ -13,7 +13,7 @@ bool x86__is_amd_cpu(void)
>  
>  	perf_env__cpuid(&env);
>  	is_amd = env.cpuid && strstarts(env.cpuid, "AuthenticAMD") ? 1 : -1;
> -
> +	perf_env__exit(&env);
>  ret:
>  	return is_amd >= 1 ? true : false;
>  }
> -- 
> 2.41.0.162.gfafddb0af9-goog
> 

-- 

- Arnaldo