linux-kernel - Re: [PATCH] hw breakpoint: Fix possible memory leak

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Date:	Mon, 27 Feb 2012 22:32:31 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Namhyung Kim <namhyung.kim@....com>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] hw breakpoint: Fix possible memory leak

2012-02-27 (월), 12:56 +0100, Ingo Molnar:
> * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> 
> > On Mon, 2012-02-27 at 11:44 +0100, Ingo Molnar wrote:
> > > I edited that code earlier today - is the form below OK, or can 
> > > you see a simpler method? It's not yet pushed out so can still 
> > > edit it. 
> > 
> > I think something like the below should do, but then I didn't really
> > think much about it, my thoughts went like:
> > 
> > ... *shees* that's ugly
> >   ... that error path already does a loop
> >     ... what the problem is!? -- reread changelog
> >       ... err_cpu == cpu is placed wrong!
> > 
> > 
> > So I replied and marked read.. waiting to either hear if there's a good
> > reason to do ugly or find a new (tested) patch in my inbox.. :-)
> > 
> > ---
> >  kernel/events/hw_breakpoint.c |    4 ++--
> >  1 files changed, 2 insertions(+), 2 deletions(-)
> > 
> > diff --git a/kernel/events/hw_breakpoint.c b/kernel/events/hw_breakpoint.c
> > index b0309f7..3330022 100644
> > --- a/kernel/events/hw_breakpoint.c
> > +++ b/kernel/events/hw_breakpoint.c
> > @@ -658,10 +658,10 @@ int __init init_hw_breakpoint(void)
> >  
> >   err_alloc:
> >  	for_each_possible_cpu(err_cpu) {
> > -		if (err_cpu == cpu)
> > -			break;
> >  		for (i = 0; i < TYPE_MAX; i++)
> >  			kfree(per_cpu(nr_task_bp_pinned[i], cpu));
> > +		if (err_cpu == cpu)
> > +			break;
> >  	}
> 
> Looks a lot nicer - I'll wait for an updated patch.
> 
> Thanks,
> 
> 	Ingo

Ingo, do you want me to resend? If so, I really don't know how to give
the credit to Peter in this case.

Or will you take the patch from him directly?


-- 
Regards,
Namhyung Kim


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