linux-kernel - Re: [PATCH] tools lib traceevent: Fix sign variable to return signed in eval_type

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Date:   Tue, 22 Oct 2019 00:09:23 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>, Jiri Olsa <jolsa@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        GwanYeong Kim <gy741.kim@...il.com>
Subject: Re: [PATCH] tools lib traceevent: Fix sign variable to return signed
 in eval_type_str()

Hi Steve,

On Sat, Oct 19, 2019 at 6:07 AM Steven Rostedt <rostedt@...dmis.org> wrote:
>
>
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
>
> Seems that the value returned by eval_type_str() were always unsigned, and
> never signed extended. Luckily, looking at all the trace events that
> actually have a signed value seldom (if ever) are negative, so this bug
> never showed its face, and if it has, nobody noticed it.
>
> Converted the sign variable to boolean while at it.
>
> Link: http://lkml.kernel.org/r/20191013134903.5f879ad1@gandalf.local.home
> Fixes: f7d82350e597d ("tools/events: Add files to create libtraceevent.a")
> Reported-by: GwanYeong Kim <gy741.kim@...il.com>
> Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks
Namhyung


> ---
>  tools/lib/traceevent/event-parse.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/lib/traceevent/event-parse.c b/tools/lib/traceevent/event-parse.c
> index d948475585ce..2b20063813ac 100644
> --- a/tools/lib/traceevent/event-parse.c
> +++ b/tools/lib/traceevent/event-parse.c
> @@ -2217,7 +2217,7 @@ static char *arg_eval (struct tep_print_arg *arg);
>  static unsigned long long
>  eval_type_str(unsigned long long val, const char *type, int pointer)
>  {
> -       int sign = 0;
> +       bool sign = true;
>         char *ref;
>         int len;
>
> @@ -2277,7 +2277,7 @@ eval_type_str(unsigned long long val, const char *type, int pointer)
>                 return (unsigned long long)(int)val & 0xffffffff;
>
>         if (strncmp(type, "unsigned ", 9) == 0) {
> -               sign = 0;
> +               sign = false;
>                 type += 9;
>         }
>
> --
> 2.20.1
>