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

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Date:	Mon, 27 Feb 2012 20:40:38 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Namhyung Kim <namhyung@...il.com>
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


* Namhyung Kim <namhyung@...il.com> wrote:

> 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.

Just mention it in the changelog that this solution was his 
idea. It was you who did most of the work: found the bug, wrote 
the patch, wrote the changelog and tested the final patch ;-)

Thanks,

	Ingo
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