linux-kernel - Re: [PATCH v3 8/9] perf hists browser: Add option for runtime switching perf data file

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Message-ID: <20120925162053.51f60773@feng-i7>
Date:	Tue, 25 Sep 2012 16:20:53 +0800
From:	Feng Tang <feng.tang@...el.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	<acme@...hat.com>, <mingo@...e.hu>, <a.p.zijlstra@...llo.nl>,
	<andi@...stfloor.org>, <dsahern@...il.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 8/9] perf hists browser: Add option for runtime
 switching perf data file

On Tue, 25 Sep 2012 11:11:21 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> On Mon, 24 Sep 2012 23:24:10 +0800, Feng Tang wrote:
> [snip]
> > +		if (!check_perf_magic(magic)) {
> > +			options[nr_options] = strdup(name);
> > +			abs_path[nr_options++] = strdup(path);
> 
> Need to check return values.
> 
> 
> > +		}
> > +		fclose(file);
> > +	}
> > +	closedir(pwd_dir);
> > +
> > +	if (nr_options) {
> > +		choice = ui__popup_menu(nr_options, options);
> > +		if (choice < nr_options && choice >= 0) {
> > +			input_name = strdup(abs_path[choice]);
> 
> Ditto.  Plus it might leak previous input_name.

Nice catch, will check the return value of "strdup". 

For input_name mem leak, in some cases the input_name can't be called
 with free(), like those got from parse "-i" option. In case the old
input_name is got from malloc through strdup, I think it's not a big
issue given that buffer will be freed any way when the application exit.

Thanks,
Feng

> 
> Thanks,
> Namhyung
> 
> 
> > +			ret = 0;
> > +		}
> > +	}
> > +
> > +	free_popup_options(options, nr_options);
> > +	free_popup_options(abs_path, nr_options);
> > +	return ret;
> > +}
> > +
> > +
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