linux-kernel - Re: [PATCH] tools lib traceevent: Fix missed freeing of subargs in free

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Date:	Mon, 01 Oct 2012 22:16:35 +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@...radead.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH] tools lib traceevent: Fix missed freeing of subargs in
 free_arg() in filter

Hi Steve,

2012-09-28 (금), 19:21 -0400, Steven Rostedt:
> Some of args were missed in free_args(), as well as subargs.
> That is args like FILTER_ARG_NUM have left and right pointers to
> other args that also need to be freed.
> 
> Signed-off-by: Steven Rostedt <rostedt@...dmis.org>
> ---
>  tools/lib/traceevent/parse-filter.c |   11 +++++++++++
>  1 files changed, 11 insertions(+), 0 deletions(-)
> 
> diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
> index ad17855..2d907cb 100644
> --- a/tools/lib/traceevent/parse-filter.c
> +++ b/tools/lib/traceevent/parse-filter.c
> @@ -209,7 +209,12 @@ static void free_arg(struct filter_arg *arg)
>  	switch (arg->type) {
>  	case FILTER_ARG_NONE:
>  	case FILTER_ARG_BOOLEAN:
> +		break;
> +
>  	case FILTER_ARG_NUM:
> +	case FILTER_ARG_EXP:
> +		free_arg(arg->op.left);
> +		free_arg(arg->op.right);

Although they have same layout, wouldn't it be better using their own
fields?

	case FILTER_ARG_NUM:
		free_arg(arg->num.left);
		free_arg(arg->num.right);
		break;

	case FILTER_ARG_EXP:
		free_arg(arg->exp.left);
		free_arg(arg->exp.right);
		break;

Thanks,
Namhyung


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