linux-kernel - Re: [PATCH] tools lib traceevent: add checks for returned EVENT

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Message-ID: <20150809031058.GD29295@danjae.kornet>
Date:	Sun, 9 Aug 2015 12:10:58 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Dean Nelson <dnelson@...hat.com>, mingo@...hat.com,
	rostedt@...dmis.org, acme@...nel.org, linux-kernel@...r.kernel.org,
	jolsa@...nel.org
Subject: Re: [PATCH] tools lib traceevent: add checks for returned
 EVENT_ERROR type

On Fri, Aug 07, 2015 at 12:59:10PM +0200, Jiri Olsa wrote:
> On Mon, Aug 03, 2015 at 01:08:05PM -0400, Dean Nelson wrote:
> > The second warning message and SIGSEGV stem from the issue expressed in the
> > first warning message, and are the result of ignoring the EVENT_ERROR type
> > returned back through the call chain.
> > 
> > Dealing with the first warning message is beyond the scope of this patch. But
> > the second warning is addressed by this patch's first hunk. And the SIGSEGV is
> > eliminated by its second hunk.
> > 
> > Signed-off-by: Dean Nelson <dnelson@...hat.com>
> > ---
> >  tools/lib/traceevent/event-parse.c | 5 ++++-
> >  1 file changed, 4 insertions(+), 1 deletion(-)
> > 
> > diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> > index cc25f05..72e2933 100644
> > --- a/tools/lib/traceevent/event-parse.c
> > +++ b/tools/lib/traceevent/event-parse.c
> > @@ -1680,6 +1680,9 @@ process_cond(struct event_format *event, struct print_arg *top, char **tok)
> >  	type = process_arg(event, left, &token);
> >  
> >   again:
> > +	if (type == EVENT_ERROR)
> > +		goto out_free;
> > +
> >  	/* Handle other operations in the arguments */
> >  	if (type == EVENT_OP && strcmp(token, ":") != 0) {
> >  		type = process_op(event, left, &token);
> > @@ -1940,7 +1943,7 @@ process_op(struct event_format *event, struct print_arg *arg, char **tok)
> >  
> >  		type = process_arg_token(event, right, tok, type);
> >  
> > -		if (right->type == PRINT_OP &&
> > +		if (type != EVENT_ERROR && right->type == PRINT_OP &&

I think you'd better put the error check on separate lines.  Other
than that look good to me.

Thanks,
Namhyung


> >  		    get_op_prio(arg->op.op) < get_op_prio(right->op.op)) {
> >  			struct print_arg tmp;
> >  
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