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

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Date:	Thu, 10 Dec 2009 10:39:47 +0800
From:	"Helight.Xu" <helight.xu@...il.com>
To:	Phil Carmody <ext-phil.2.carmody@...ia.com>
CC:	mingo@...e.hu, peterz@...radead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] sched: Memory leak in two error corner cases

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?
>  
>  		init_tg_cfs_entry(tg, cfs_rq, se, i, 0, parent->se[i]);
>  	}
> @@ -9929,8 +9931,10 @@ int alloc_rt_sched_group(struct task_group *tg, struct task_group *parent)
>  
>  		rt_se = kzalloc_node(sizeof(struct sched_rt_entity),
>  				     GFP_KERNEL, cpu_to_node(i));
> -		if (!rt_se)
> +		if (!rt_se) {
> +			kfree(rt_rq);
>  			goto err;
> +		}
>  
>  		init_tg_rt_entry(tg, rt_rq, rt_se, i, 0, parent->rt_se[i]);
>  	}
>   


-- 
---------------------------------
Zhenwen Xu - Open and Free
Home Page:	http://zhwen.org

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