linux-kernel - Re: [PATCH] mtd: mtdpart: fix add_mtd

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Date:	Wed, 30 Sep 2015 10:27:02 +0200
From:	Boris Brezillon <boris.brezillon@...e-electrons.com>
To:	David Woodhouse <dwmw2@...radead.org>,
	Brian Norris <computersforpeace@...il.com>,
	linux-mtd@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] mtd: mtdpart: fix add_mtd_partitions error path

On Thu, 30 Jul 2015 12:18:03 +0200
Boris Brezillon <boris.brezillon@...e-electrons.com> wrote:

> If we fail to allocate a partition structure in the middle of the partition
> creation process, the already allocated partitions are never removed, which
> means they are still present in the partition list and their resources are
> never freed.

Ping.

> 
> Signed-off-by: Boris Brezillon <boris.brezillon@...e-electrons.com>
> Cc: stable@...r.kernel.org
> ---
>  drivers/mtd/mtdpart.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
> index cafdb88..919a936 100644
> --- a/drivers/mtd/mtdpart.c
> +++ b/drivers/mtd/mtdpart.c
> @@ -664,8 +664,10 @@ int add_mtd_partitions(struct mtd_info *master,
>  
>  	for (i = 0; i < nbparts; i++) {
>  		slave = allocate_partition(master, parts + i, i, cur_offset);
> -		if (IS_ERR(slave))
> +		if (IS_ERR(slave)) {
> +			del_mtd_partitions(master);
>  			return PTR_ERR(slave);
> +		}
>  
>  		mutex_lock(&mtd_partitions_mutex);
>  		list_add(&slave->list, &mtd_partitions);



-- 
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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