linux-kernel - Re: [PATCH] perf header: Fix memory leaks

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Date:   Tue, 30 Nov 2021 16:22:36 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH] perf header: Fix memory leaks

Em Tue, Nov 30, 2021 at 07:15:19PM +0100, Jiri Olsa escreveu:
> On Mon, Nov 29, 2021 at 03:38:28PM -0800, Ian Rogers wrote:
> > On Sun, Nov 28, 2021 at 7:47 AM Jiri Olsa <jolsa@...hat.com> wrote:
> > >
> > > On Thu, Nov 18, 2021 at 12:17:30PM -0800, Ian Rogers wrote:
> > > > These leaks were found with leak sanitizer running "perf pipe recording
> > > > and injection test". In pipe mode feat_fd may hold onto an events struct
> > > > that needs freeing. When string features are processed they may
> > > > overwrite an already created string, so free this before the overwrite.
> > > >
> > > > Signed-off-by: Ian Rogers <irogers@...gle.com>
> > > > ---
> > > >  tools/perf/util/header.c | 15 ++++++++++-----
> > > >  1 file changed, 10 insertions(+), 5 deletions(-)
> > > >
> > > > diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
> > > > index 79cce216727e..e3c1a532d059 100644
> > > > --- a/tools/perf/util/header.c
> > > > +++ b/tools/perf/util/header.c
> > > > @@ -2321,6 +2321,7 @@ static int perf_header__read_build_ids(struct perf_header *header,
> > > >  #define FEAT_PROCESS_STR_FUN(__feat, __feat_env) \
> > > >  static int process_##__feat(struct feat_fd *ff, void *data __maybe_unused) \
> > > >  {\
> > > > +     free(ff->ph->env.__feat_env);                \
> > >
> > > hm, how is this set before this callback is triggered?
> > 
> > I see it for cpuid which is initially set in:
> > #0  perf_env__read_cpuid (env=0x62b000007240) at util/env.c:363
> > #1  0x0000555556325153 in perf_env__cpuid (env=0x62b000007240) at util/env.c:456
> > #2  0x00005555564002ff in evlist__init_trace_event_sample_raw
> 
> ok, I forgot we do this one, thanks for explanation
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks, applied.

- Arnaldo