linux-kernel - Re: [PATCH] tracing/filters: Defer pred allocation, fix memory leak

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Message-ID: <20090901093159.GA6485@nowhere>
Date:	Tue, 1 Sep 2009 11:32:02 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] tracing/filters: Defer pred allocation, fix memory leak

On Tue, Sep 01, 2009 at 01:31:38PM +0800, Li Zefan wrote:
> Check if we have already allocated memory for filter preds.
> 
> Spotted-by: Frederic Weisbecker <fweisbec@...il.com>
> Signed-off-by: Li Zefan <lizf@...fujitsu.com>


Acked-by: Frederic Weisbecker <fweisbec@...il.com>


> ---
>  kernel/trace/trace_events_filter.c |   11 ++++++-----
>  1 files changed, 6 insertions(+), 5 deletions(-)
> 
> diff --git a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
> index c6b2edf..93660fb 100644
> --- a/kernel/trace/trace_events_filter.c
> +++ b/kernel/trace/trace_events_filter.c
> @@ -409,6 +409,9 @@ static int init_preds(struct ftrace_event_call *call)
>  	struct filter_pred *pred;
>  	int i;
>  
> +	if (call->filter)
> +		return 0;
> +
>  	filter = call->filter = kzalloc(sizeof(*filter), GFP_KERNEL);
>  	if (!call->filter)
>  		return -ENOMEM;
> @@ -447,11 +450,9 @@ static int init_subsystem_preds(struct event_subsystem *system)
>  		if (strcmp(call->system, system->name) != 0)
>  			continue;
>  
> -		if (!call->filter) {
> -			err = init_preds(call);
> -			if (err)
> -				return err;
> -		}
> +		err = init_preds(call);
> +		if (err)
> +			return err;
>  	}
>  
>  	return 0;
> -- 
> 1.6.3
> 

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