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

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Date:	Thu, 23 Aug 2012 05:30:23 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Namhyung Kim <namhyung@...nel.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()

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

-- Steve

>  	switch (errnum) {


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