linux-kernel - Re: [PATCH] tracing/kprobe: Release kprobe print

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Date:   Mon, 9 Jul 2018 16:40:22 +0000
From:   Song Liu <songliubraving@...com>
To:     Jiri Olsa <jolsa@...nel.org>
CC:     Steven Rostedt <rostedt@...dmis.org>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Yonghong Song <yhs@...com>, Josef Bacik <jbacik@...com>,
        Daniel Borkmann <daniel@...earbox.net>,
        "David S. Miller" <davem@...emloft.net>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] tracing/kprobe: Release kprobe print_fmt properly



> On Jul 9, 2018, at 7:19 AM, Jiri Olsa <jolsa@...nel.org> wrote:
> 
> We don't release tk->tp.call.print_fmt when destroying
> local uprobe. Also there's missing print_fmt kfree in
> create_local_trace_kprobe error path.
> 
> Fixes: e12f03d7031a ("perf/core: Implement the 'perf_kprobe' PMU")
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Thanks for the fix!

Acked-by: Song Liu <songliubraving@...com>


> ---
> kernel/trace/trace_kprobe.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/kernel/trace/trace_kprobe.c b/kernel/trace/trace_kprobe.c
> index daa81571b22a..21f718472942 100644
> --- a/kernel/trace/trace_kprobe.c
> +++ b/kernel/trace/trace_kprobe.c
> @@ -1480,8 +1480,10 @@ create_local_trace_kprobe(char *func, void *addr, unsigned long offs,
> 	}
> 
> 	ret = __register_trace_kprobe(tk);
> -	if (ret < 0)
> +	if (ret < 0) {
> +		kfree(tk->tp.call.print_fmt);
> 		goto error;
> +	}
> 
> 	return &tk->tp.call;
> error:
> @@ -1501,6 +1503,8 @@ void destroy_local_trace_kprobe(struct trace_event_call *event_call)
> 	}
> 
> 	__unregister_trace_kprobe(tk);
> +
> +	kfree(tk->tp.call.print_fmt);
> 	free_trace_kprobe(tk);
> }
> #endif /* CONFIG_PERF_EVENTS */
> -- 
> 2.17.1
>