linux-kernel - Re: [PATCH v4 2/5] perf tools riscv: Add support for get_cpuid

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Date:   Sat, 25 Jun 2022 08:28:13 +0300
From:   Nikita Shubin <nikita.shubin@...uefel.me>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Atish Patra <atishp@...shpatra.org>,
        Anup Patel <anup@...infault.org>,
        João Mário Domingos 
        <joao.mario@...nico.ulisboa.pt>, linux@...ro.com,
        Nikita Shubin <n.shubin@...ro.com>,
        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>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Subject: Re: [PATCH v4 2/5] perf tools riscv: Add support for get_cpuid_str
 function

Hello Arnaldo!

On Fri, 24 Jun 2022 13:32:20 -0300
Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> > +	if (mimpid)
> > +		free(mimpid);  
> 
> just use:
> 
> 	
> 	free(mvendorid);
> 	free(marchid);
> 	free(mimpid);
> 
> fewer lines, free() accepts NULL.
> 
> > +
> > +	return cpuid;
> > +}
> > +
> > +int get_cpuid(char *buffer, size_t sz)
> > +{
> > +	char *cpuid = _get_cpuid();
> > +
> > +	if (sz < strlen(cpuid)) {
> > +		free(cpuid);
> > +		return -EINVAL;
> > +	}
> > +
> > +	scnprintf(buffer, sz, "%s", cpuid);  
> 
> You're leaking cpuid here.

Agree with both.

Thank you for pointing it out.

> 
> > +	return 0;
> > +}
> > +
> > +char *
> > +get_cpuid_str(struct perf_pmu *pmu __maybe_unused)
> > +{
> > +	return _get_cpuid();
> > +}
> > -- 
> > 2.35.1  
>