linux-kernel - Re: [PATCH -tip ] [BUGFIX] perf probe: fix to initialize fname always before use it

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Date:	Fri, 11 Oct 2013 21:31:47 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Namhyung Kim <namhyung@...nel.org>, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	lkml <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH -tip ] [BUGFIX] perf probe: fix to initialize fname always
 before use it

Hi Arnaldo,

I've found a bug in my previous patch which was already picked
in the perf/urgent branch. The buggy commit id is

e08cfd4bda7683cdbe6971c26cf23e2afdb1e7a8

And this is not related to the previous series of perf probe
updates.

Thank you,

(2013/10/11 21:23), Masami Hiramatsu wrote:
> Fix perf probe --list to initialize fname local var always before
> use it. This may cause a SEGV if there is a probe which is in
> the function body but not in any inline function.
> 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> Cc: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/probe-finder.c |    2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index c044052..e41b094 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -1460,10 +1460,10 @@ int debuginfo__find_probe_point(struct debuginfo *self, unsigned long addr,
>  			goto post;
>  		}
>  
> +		fname = dwarf_decl_file(&spdie);
>  		if (addr == (unsigned long)baseaddr) {
>  			/* Function entry - Relative line number is 0 */
>  			lineno = baseline;
> -			fname = dwarf_decl_file(&spdie);
>  			goto post;
>  		}


-- 
Masami HIRAMATSU
IT Management Research Dept. Linux Technology Center
Hitachi, Ltd., Yokohama Research Laboratory
E-mail: masami.hiramatsu.pt@...achi.com


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