linux-kernel - Re: [PATCH perf/core 01/13] perf probe: Fix to free temporal Dwarf

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Date:	Wed, 18 Nov 2015 19:36:39 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Ingo Molnar <mingo@...hat.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Jiri Olsa <jolsa@...hat.com>
Subject: Re: [PATCH perf/core 01/13] perf probe: Fix to free temporal
 Dwarf_Frame

Em Wed, Nov 18, 2015 at 03:40:12PM +0900, Masami Hiramatsu escreveu:
> Since dwarf_cfi_addrframe returns malloc'd Dwarf_Frame
> object, it has to be freed after used.

Applied to perf/urgent
 
> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> ---
>  tools/perf/util/probe-finder.c |    9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index 63993d7..4d7d4f4 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -683,21 +683,24 @@ static int call_probe_finder(Dwarf_Die *sc_die, struct probe_finder *pf)
>  	ret = dwarf_getlocation_addr(&fb_attr, pf->addr, &pf->fb_ops, &nops, 1);
>  	if (ret <= 0 || nops == 0) {
>  		pf->fb_ops = NULL;
> +		ret = 0;
>  #if _ELFUTILS_PREREQ(0, 142)
>  	} else if (nops == 1 && pf->fb_ops[0].atom == DW_OP_call_frame_cfa &&
>  		   pf->cfi != NULL) {
> -		Dwarf_Frame *frame;
> +		Dwarf_Frame *frame = NULL;
>  		if (dwarf_cfi_addrframe(pf->cfi, pf->addr, &frame) != 0 ||
>  		    dwarf_frame_cfa(frame, &pf->fb_ops, &nops) != 0) {
>  			pr_warning("Failed to get call frame on 0x%jx\n",
>  				   (uintmax_t)pf->addr);
> -			return -ENOENT;
> +			ret = -ENOENT;
>  		}
> +		free(frame);
>  #endif
>  	}
>  
>  	/* Call finder's callback handler */
> -	ret = pf->callback(sc_die, pf);
> +	if (ret >= 0)
> +		ret = pf->callback(sc_die, pf);
>  
>  	/* *pf->fb_ops will be cached in libdw. Don't free it. */
>  	pf->fb_ops = NULL;
--
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