linux-kernel - Re: [PATCH 1/1] perf data: Fix error return code in perf_data__create

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Date:   Mon, 19 Apr 2021 14:14:31 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Zhen Lei <thunder.leizhen@...wei.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-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] perf data: Fix error return code in
 perf_data__create_dir()

Em Thu, Apr 15, 2021 at 01:38:40PM +0200, Jiri Olsa escreveu:
> On Thu, Apr 15, 2021 at 04:34:16PM +0800, Zhen Lei wrote:
> > Although 'ret' has been initialized to -1, but it will be reassigned by
> > the "ret = open(...)" statement in the for loop. So that, the value of
> > 'ret' is unknown when asprintf() failed.
> > 
> > Reported-by: Hulk Robot <hulkci@...wei.com>
> > Signed-off-by: Zhen Lei <thunder.leizhen@...wei.com>
> 
> Acked-by: Jiri Olsa <jolsa@...hat.com>

Thanks, applied.

- Arnaldo

 
> thanks,
> jirka
> 
> > ---
> >  tools/perf/util/data.c | 5 +++--
> >  1 file changed, 3 insertions(+), 2 deletions(-)
> > 
> > diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> > index f29af4fc3d09390..8fca4779ae6a8e9 100644
> > --- a/tools/perf/util/data.c
> > +++ b/tools/perf/util/data.c
> > @@ -35,7 +35,7 @@ void perf_data__close_dir(struct perf_data *data)
> >  int perf_data__create_dir(struct perf_data *data, int nr)
> >  {
> >  	struct perf_data_file *files = NULL;
> > -	int i, ret = -1;
> > +	int i, ret;
> >  
> >  	if (WARN_ON(!data->is_dir))
> >  		return -EINVAL;
> > @@ -51,7 +51,8 @@ int perf_data__create_dir(struct perf_data *data, int nr)
> >  	for (i = 0; i < nr; i++) {
> >  		struct perf_data_file *file = &files[i];
> >  
> > -		if (asprintf(&file->path, "%s/data.%d", data->path, i) < 0)
> > +		ret = asprintf(&file->path, "%s/data.%d", data->path, i);
> > +		if (ret < 0)
> >  			goto out_err;
> >  
> >  		ret = open(file->path, O_RDWR|O_CREAT|O_TRUNC, S_IRUSR|S_IWUSR);
> > -- 
> > 2.26.0.106.g9fadedd
> > 
> > 
> 

-- 

- Arnaldo