linux-kernel - Re: [PATCH 12/31] perf probe: Reset args and nargs for probe_trace

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Date:	Thu, 29 Oct 2015 19:39:41 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Cc:	Wang Nan <wangnan0@...wei.com>, ast@...mgrid.com,
	brendan.d.gregg@...il.com, a.p.zijlstra@...llo.nl,
	daniel@...earbox.net, dsahern@...il.com, hekuang@...wei.com,
	jolsa@...nel.org, lizefan@...wei.com, namhyung@...nel.org,
	paulus@...ba.org, linux-kernel@...r.kernel.org, pi3orama@....com,
	xiakaixu@...wei.com
Subject: Re: [PATCH 12/31] perf probe: Reset args and nargs for
 probe_trace_event when failure

Em Wed, Oct 14, 2015 at 12:41:23PM +0000, Wang Nan escreveu:
> When failure occures in add_probe_trace_event(), args in
> probe_trace_event is incomplete. Since information in it may be used
> in futher, this patch frees the allocated memory and set it to NULL
> to avoid dangling pointer.

Masami, can I have your Acked-by for this one?

Thanks,

- Arnaldo
 
> Signed-off-by: Wang Nan <wangnan0@...wei.com>
> Cc: Alexei Starovoitov <ast@...mgrid.com>
> Cc: Brendan Gregg <brendan.d.gregg@...il.com>
> Cc: Daniel Borkmann <daniel@...earbox.net>
> Cc: David Ahern <dsahern@...il.com>
> Cc: He Kuang <hekuang@...wei.com>
> Cc: Jiri Olsa <jolsa@...nel.org>
> Cc: Kaixu Xia <xiakaixu@...wei.com>
> Cc: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> Cc: Namhyung Kim <namhyung@...nel.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> Cc: Zefan Li <lizefan@...wei.com>
> Cc: pi3orama@....com
> Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
> Link: http://lkml.kernel.org/n/ebpf-6yw9eg0ej3l4jnqhinngkw86@git.kernel.org
> ---
>  tools/perf/util/probe-finder.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
> index bd8f03d..b1581d7 100644
> --- a/tools/perf/util/probe-finder.c
> +++ b/tools/perf/util/probe-finder.c
> @@ -1235,6 +1235,10 @@ static int add_probe_trace_event(Dwarf_Die *sc_die, struct probe_finder *pf)
>  
>  end:
>  	free(args);
> +	if (ret) {
> +		tev->nargs = 0;
> +		zfree(&tev->args);
> +	}
>  	return ret;
>  }
>  
> -- 
> 1.8.3.4
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