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

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Date:   Wed, 11 Jul 2018 08:54:29 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Song Liu <songliubraving@...com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Yonghong Song <yhs@...com>, Josef Bacik <jbacik@...com>,
        daniel@...earbox.net, 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


Masami,

Can you ack this? If I don't hear from you by tomorrow, I'm going to
push it to Linus, because I'll be on PTO after that.

Thanks!

-- Steve


On Tue, 10 Jul 2018 09:04:17 -0400
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon,  9 Jul 2018 16:19:06 +0200
> 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.  
> 
> OK, I finished testing and I'm all ready to push, but then I noticed
> that Masami wasn't Cc'd. I like to get his ack before pushing to Linus.
> 
> -- Steve
> 
> 
> > 
> > Fixes: e12f03d7031a ("perf/core: Implement the 'perf_kprobe' PMU")
> > Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> > ---
> >  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 */  
>