linux-kernel - Re: [PATCH] perf_event: fix error handling path

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Message-ID: <AANLkTimFjH6JZjOhPBrHmfpRycs4gDJuCpa+koxEyNgY@mail.gmail.com>
Date:	Mon, 6 Dec 2010 09:59:37 +0800
From:	jovi zhang <bookjovi@...il.com>
To:	Thiago Farina <tfransosi@...il.com>
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...e.hu,
	acme@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf_event: fix error handling path

On Sun, Dec 5, 2010 at 8:29 PM, Thiago Farina <tfransosi@...il.com> wrote:
>
> On Sat, Dec 4, 2010 at 1:19 AM,  <bookjovi@...il.com> wrote:
> > fix error handling path
> >
> > Signed-off-by: Jovi Zhang <bookjovi@...il.com>
> >  kernel/perf_event.c |    2 --
> >  1 files changed, 0 insertions(+), 2 deletions(-)
> >
> > diff --git a/kernel/perf_event.c b/kernel/perf_event.c
> > index cb6c0d2..62f9e9d 100644
> > --- a/kernel/perf_event.c
> > +++ b/kernel/perf_event.c
> > @@ -1918,8 +1918,6 @@ static int get_callchain_buffers(void)
> >        }
> >
> >        err = alloc_callchain_buffers();
> > -       if (err)
> > -               release_callchain_buffers();
>
> Care to explain in the change log message? As I reader, is not clear
> to me what is wrong with this.

Sorry, the description should be as:
fix error handling path. alloc_callchain_buffers() can return -ENOMEM,
in this time callchain_cpus_entries maybe is NULL, It will oops if
invoke release_callchain_buffers() when callchain_cpus_entries is
NULL.
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