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Subject: Re: [PATCH V2 4/5] ubi: Reserve sufficient buffer length for the
 input mask
To:     ZhaoLong Wang <wangzhaolong1@huawei.com>, <richard@nod.at>,
        <miquel.raynal@bootlin.com>, <vigneshr@ti.com>
CC:     <linux-mtd@lists.infradead.org>, <linux-kernel@vger.kernel.org>,
        <yi.zhang@huawei.com>
References: <20230718085119.3885747-1-wangzhaolong1@huawei.com>
 <20230718085119.3885747-5-wangzhaolong1@huawei.com>
From:   Zhihao Cheng <chengzhihao1@huawei.com>
Message-ID: <412c027f-a96c-6de3-f493-749566e8c3ac@huawei.com>
Date:   Mon, 31 Jul 2023 20:13:55 +0800
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?? 2023/7/18 16:51, ZhaoLong Wang д??:
> Because the mask received by the emulate_failures interface
> is a 32-bit unsigned integer, ensure that there is sufficient
> buffer length to receive and display this value.
> 
> Signed-off-by: ZhaoLong Wang <wangzhaolong1@huawei.com>
> ---
> V2:
>    - A 16-byte buffer is reserved, as implemented by other interfaces.
> 
>   drivers/mtd/ubi/debug.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
> index 016a861c5029..1c3f1a2436e5 100644
> --- a/drivers/mtd/ubi/debug.c
> +++ b/drivers/mtd/ubi/debug.c
> @@ -332,7 +332,7 @@ static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
>   	struct dentry *dent = file->f_path.dentry;
>   	struct ubi_device *ubi;
>   	struct ubi_debug_info *d;
> -	char buf[8];
> +	char buf[16];
>   	int val;
>   
>   	ubi = ubi_get_device(ubi_num);
> @@ -400,7 +400,7 @@ static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
>   	struct ubi_device *ubi;
>   	struct ubi_debug_info *d;
>   	size_t buf_size;
> -	char buf[8] = {0};
> +	char buf[16] = {0};
>   	int val;
>   
>   	ubi = ubi_get_device(ubi_num);
> 


Reviewed-by: Zhihao Cheng <chengzhihao1@huawei.com>