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

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Message-ID: <55C89C05.2080904@redhat.com>
Date:	Mon, 10 Aug 2015 07:41:41 -0500
From:	Dean Nelson <dnelson@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, mingo@...hat.com,
	rostedt@...dmis.org, acme@...nel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools lib traceevent: add checks for returned EVENT_ERROR
 type

On 08/08/2015 10:10 PM, Namhyung Kim wrote:
> 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.

Okay. I've posted a v2. Consider v1 NAK'd.

And thank you Namhyung for reviewing this patch!


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