linux-kernel - Re: tools lib traceevent: Report better error message on bad function args

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Date:	Mon, 18 Nov 2013 21:31:31 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Jiri Olsa <jolsa@...hat.com>, Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: tools lib traceevent: Report better error message on bad
 function args

On Tue, 19 Nov 2013 11:23:56 +0900
Namhyung Kim <namhyung@...nel.org> wrote:
 
> >  	arg->type = PRINT_FUNC;
> > @@ -2708,15 +2707,19 @@ process_func_handler(struct event_format *event, struct pevent_function_handler
> >  		}
> >  
> >  		type = process_arg(event, farg, &token);
> > -		if (i < (func->nr_args - 1))
> > -			test = ",";
> > -		else
> > -			test = ")";
> > -
> > -		if (test_type_token(type, token, EVENT_DELIM, test)) {
> > -			free_arg(farg);
> > -			free_token(token);
> > -			return EVENT_ERROR;
> > +		if (i < (func->nr_args - 1)) {
> > +			if (type != EVENT_DELIM || strcmp(token, ",") != 0) {
> > +				warning("Error: function '%s()' expects %d arguments but event %s only uses %d",
> > +					func->name, func->nr_args,
> > +					event->name, i + 1);
> > +				return EVENT_ERROR;
> > +			}
> > +		} else {
> > +			if (type != EVENT_DELIM || strcmp(token, ")") != 0) {
> > +				warning("Error: function '%s()' only expects %d arguments but event %s has more",
> > +					func->name, func->nr_args, event->name);
> > +				return EVENT_ERROR;
> 
> It seems that you missed to free farg and token in error paths.
> 

Ug, you're right!

Thanks for the review. v2 coming up.

-- Steve
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