linux-kernel - Re: [PATCH] sched: Memory leak in two error corner cases

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Message-ID: <1260421963.4165.0.camel@twins>
Date:	Thu, 10 Dec 2009 06:12:43 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Helight.Xu" <helight.xu@...il.com>
Cc:	Phil Carmody <ext-phil.2.carmody@...ia.com>, mingo@...e.hu,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: Memory leak in two error corner cases

On Thu, 2009-12-10 at 10:39 +0800, Helight.Xu wrote:
> Phil Carmody wrote:
> > From: Phil Carmody <ext-phil.2.carmody@...ia.com>
> >
> > If the second in each of these pairs of allocations fails, then
> > the first one will not be freed in the error route out.
> >
> > Found by a static code analysis tool.
> >
> > Signed-off-by: Phil Carmody <ext-phil.2.carmody@...ia.com>
> > ---
> >  kernel/sched.c |    8 ++++++--
> >  1 files changed, 6 insertions(+), 2 deletions(-)
> >
> > diff --git a/kernel/sched.c b/kernel/sched.c
> > index e7f2cfa..29ebc4a 100644
> > --- a/kernel/sched.c
> > +++ b/kernel/sched.c
> > @@ -9841,8 +9841,10 @@ int alloc_fair_sched_group(struct task_group *tg, struct task_group *parent)
> >  
> >  		se = kzalloc_node(sizeof(struct sched_entity),
> >  				  GFP_KERNEL, cpu_to_node(i));
> > -		if (!se)
> > +		if (!se) {
> > +			kfree(cfs_rq);
> >  			goto err;
> > +		}
> >   
> if here has menory leak, why not  here!
> 
>     tg->cfs_rq = kzalloc(sizeof(cfs_rq) * nr_cpu_ids, GFP_KERNEL);
>     if (!tg->cfs_rq)
>          goto err;
>     tg->se = kzalloc(sizeof(se) * nr_cpu_ids, GFP_KERNEL);
>     if (!tg->se)
>          goto err;
> should I fix here?

The error path deals with that.
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