linux-kernel - Re: [PATCH] perf tools: Fix perf_evlist__alloc

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Message-ID: <20160601124312.GN2563@kernel.org>
Date:	Wed, 1 Jun 2016 09:43:12 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <mhiramat@...nel.org>
Cc:	Wang Nan <wangnan0@...wei.com>, pi3orama@....com,
	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	He Kuang <hekuang@...wei.com>, Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Zefan Li <lizefan@...wei.com>
Subject: Re: [PATCH] perf tools: Fix perf_evlist__alloc_mmap() failure path

Em Tue, May 31, 2016 at 10:27:43PM +0900, Masami Hiramatsu escreveu:
> On Tue, 31 May 2016 13:06:15 +0000
> Wang Nan <wangnan0@...wei.com> wrote:
> 
> > If zalloc fail, setting evlist->mmap[i].fd is unsafe.
> > perf_evlist__alloc_mmap() should fail right after zalloc() fail.
> 
> Good catch!!
> 
> Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>

Applied, after adding a:

Fixes: d4c6fb36ac2c ("perf evsel: Record fd into perf_mmap")
 
> Thanks!
> 
> > 
> > Signed-off-by: Wang Nan <wangnan0@...wei.com>
> > Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> > Cc: He Kuang <hekuang@...wei.com>
> > Cc: Jiri Olsa <jolsa@...nel.org>
> > Cc: Masami Hiramatsu <mhiramat@...nel.org>
> > Cc: Namhyung Kim <namhyung@...nel.org>
> > Cc: Zefan Li <lizefan@...wei.com>
> > Cc: pi3orama@....com
> > ---
> >  tools/perf/util/evlist.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
> > index e0f3094..1b918aa 100644
> > --- a/tools/perf/util/evlist.c
> > +++ b/tools/perf/util/evlist.c
> > @@ -946,9 +946,12 @@ static int perf_evlist__alloc_mmap(struct perf_evlist *evlist)
> >  	if (cpu_map__empty(evlist->cpus))
> >  		evlist->nr_mmaps = thread_map__nr(evlist->threads);
> >  	evlist->mmap = zalloc(evlist->nr_mmaps * sizeof(struct perf_mmap));
> > +	if (!evlist->mmap)
> > +		return -ENOMEM;
> > +
> >  	for (i = 0; i < evlist->nr_mmaps; i++)
> >  		evlist->mmap[i].fd = -1;
> > -	return evlist->mmap != NULL ? 0 : -ENOMEM;
> > +	return 0;
> >  }
> >  
> >  struct mmap_params {
> > -- 
> > 1.8.3.4
> > 
> 
> 
> -- 
> Masami Hiramatsu <mhiramat@...nel.org>