linux-kernel - Re: [PATCH 2/6] mtd: nandsim: Fix kasprintf() usage

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Date:	Tue, 16 Jun 2015 19:07:07 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Richard Weinberger <richard@....at>
Cc:	dwmw2@...radead.org, maximlevitsky@...il.com,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/6] mtd: nandsim: Fix kasprintf() usage

On Mon, Jun 01, 2015 at 11:10:50PM +0200, Richard Weinberger wrote:
> kasprintf() used in get_partition_name() does a dynamic
> memory allocation and can fail. We have to handle that case.
> 
> Signed-off-by: Richard Weinberger <richard@....at>
> ---
>  drivers/mtd/nand/nandsim.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/mtd/nand/nandsim.c b/drivers/mtd/nand/nandsim.c
> index f232427..52c0c1a 100644
> --- a/drivers/mtd/nand/nandsim.c
> +++ b/drivers/mtd/nand/nandsim.c
> @@ -743,6 +743,11 @@ static int init_nandsim(struct mtd_info *mtd)
>  			goto error;
>  		}
>  		ns->partitions[i].name   = get_partition_name(i);
> +		if (!ns->partitions[i].name) {
> +			NS_ERR("unable to allocate memory.\n");

Probably don't really need the allocation failure messages. But this
matches the current style, so we can just rip the messages out at
another time.

> +			ret = -ENOMEM;
> +			goto error;
> +		}
>  		ns->partitions[i].offset = next_offset;
>  		ns->partitions[i].size   = part_sz;
>  		next_offset += ns->partitions[i].size;
> @@ -756,6 +761,11 @@ static int init_nandsim(struct mtd_info *mtd)
>  			goto error;
>  		}
>  		ns->partitions[i].name   = get_partition_name(i);
> +		if (!ns->partitions[i].name) {
> +			NS_ERR("unable to allocate memory.\n");

Same here.

> +			ret = -ENOMEM;
> +			goto error;
> +		}
>  		ns->partitions[i].offset = next_offset;
>  		ns->partitions[i].size   = remains;
>  		ns->nbparts += 1;

Brian
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