linux-kernel - Re: [PATCH perf/core v5 04/15] perf probe: Add --cache option to cache the probe definitions

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Date:	Fri, 29 Apr 2016 08:14:35 +0900
From:	Masami Hiramatsu <mhiramat@...nel.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	<linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Subject: Re: [PATCH perf/core v5 04/15] perf probe: Add --cache option to
 cache the probe definitions

On Thu, 28 Apr 2016 11:12:19 +0900
Namhyung Kim <namhyung@...nel.org> wrote:

> On Thu, Apr 28, 2016 at 03:37:42AM +0900, Masami Hiramatsu wrote:
> > From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> > 
> > Add --cache option to cache the probe definitions. This
> > just saves the result of the dwarf analysis to probe cache.
> > 
> > Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> > Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> > ---
> >  Changes in v5:
> >   - Move probe_cache* definitions. (code cleanup)
> > 
> >  Changes in v4:
> >   - Remove cache saving failure message.
> > ---
> 
> [snip]
> > +static int probe_cache__load(struct probe_cache *pcache)
> > +{
> > +	struct probe_cache_entry *entry = NULL;
> > +	char buf[MAX_CMDLEN], *p;
> > +	int ret = 0;
> > +	FILE *fp;
> > +
> > +	fp = fdopen(dup(pcache->fd), "r");
> > +	while (!feof(fp)) {
> > +		if (!fgets(buf, MAX_CMDLEN, fp))
> > +			break;
> > +		p = strchr(buf, '\n');
> > +		if (p)
> > +			*p = '\0';
> > +		if (buf[0] == '#') {	/* #perf_probe_event */
> > +			entry = probe_cache_entry__new(NULL);
> 
> The probe_cache_entry__new() can fail.

Good catch!

> 
> Thanks,
> Namhyung
> 
> 
> > +			entry->spev = strdup(buf + 1);

Moreover, if this strdup fail, this goes to return but retvalue is 0...

I'll fix this too.

Thank you!

-- 
Masami Hiramatsu <mhiramat@...nel.org>