linux-kernel - Re: [PATCH] tools lib traceevent: Fix off-by-one bug in pevent

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Message-ID: <87393di0x9.fsf@sejong.aot.lge.com>
Date:	Fri, 24 Aug 2012 09:33:22 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH] tools lib traceevent: Fix off-by-one bug in pevent_strerror()

Hi, Steve

On Thu, 23 Aug 2012 05:30:23 -0400, Steven Rostedt wrote:
> On Thu, 2012-08-23 at 16:37 +0900, Namhyung Kim wrote:
>> From: Namhyung Kim <namhyung.kim@....com>
>> 
>> As pevent_errno is defined using PEVENT_ERRORS which uses _PE macro
>> magic, the first errno is bigger than __PEVENT_ERRNO_START by 1. So we
>> need to subtract the 1 also when calculating the index of the error
>> strings.
>> 
>> Cc: Fredereic Weisbecker <fweisbec@...il.com>
>> Cc: Steven Rostedt <rostedt@...dmis.org>
>> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
>> ---
>>  tools/lib/traceevent/event-parse.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>> 
>> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
>> index f978c59f67bf..b5b4d806ffa2 100644
>> --- a/tools/lib/traceevent/event-parse.c
>> +++ b/tools/lib/traceevent/event-parse.c
>> @@ -4822,7 +4822,7 @@ int pevent_strerror(struct pevent *pevent, enum pevent_errno errnum,
>>  	    errnum >= __PEVENT_ERRNO__END)
>>  		return -1;
>>  
>> -	idx = errnum - __PEVENT_ERRNO__START;
>> +	idx = errnum - __PEVENT_ERRNO__START - 1;
>>  	msg = pevent_error_str[idx];
>>  
>
> Note, if you had kept my original way, you wouldn't have this bug ;-)
>
> http://marc.info/?l=linux-kernel&m=133976417632111

Oh, I missed the BEFORE_START part at that time, sorry. :)

Thanks,
Namhyung
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