Re: [PATCH] usb: gadget: f_fs: use memdup_user

From	Michal Nazarewicz <mina86@mina86.com>
Newsgroups	linux.kernel
Subject	Re: [PATCH] usb: gadget: f_fs: use memdup_user
Date	2017-05-14 13:40 +0200
Message-ID	<tH02u-10Y-7@gated-at.bofh.it> (permalink)
References	<tGvL4-6mY-7@gated-at.bofh.it> <tGvL4-6mY-11@gated-at.bofh.it>
Organization	http://mina86.com/

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On Sat, May 13 2017, Geliang Tang wrote:
> Use memdup_user() helper instead of open-coding to simplify the code.
>
> Signed-off-by: Geliang Tang <geliangtang@gmail.com>

Acked-by: Michal Nazarewicz <mina86@mina86.com>

> ---
>  drivers/usb/gadget/function/f_fs.c | 11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c
> index 71dd27c..5754538 100644
> --- a/drivers/usb/gadget/function/f_fs.c
> +++ b/drivers/usb/gadget/function/f_fs.c
> @@ -3692,14 +3692,9 @@ static char *ffs_prepare_buffer(const char __user *buf, size_t len)
>  	if (unlikely(!len))
>  		return NULL;
>  
> -	data = kmalloc(len, GFP_KERNEL);
> -	if (unlikely(!data))
> -		return ERR_PTR(-ENOMEM);
> -
> -	if (unlikely(copy_from_user(data, buf, len))) {
> -		kfree(data);
> -		return ERR_PTR(-EFAULT);
> -	}
> +	data = memdup_user(buf, len);
> +	if (unlikely(IS_ERR(data)))
> +		return data;
>  
>  	pr_vdebug("Buffer from user space:\n");
>  	ffs_dump_mem("", data, len);

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»

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[PATCH] KEYS: use memdup_user Geliang Tang <geliangtang@gmail.com> - 2017-05-13 05:20 +0200
  [PATCH] usb: gadget: f_fs: use memdup_user Geliang Tang <geliangtang@gmail.com> - 2017-05-13 05:20 +0200
    Re: [PATCH] usb: gadget: f_fs: use memdup_user Dan Carpenter <dan.carpenter@oracle.com> - 2017-05-13 10:10 +0200
      Re: [PATCH] usb: gadget: f_fs: use memdup_user Al Viro <viro@ZenIV.linux.org.uk> - 2017-05-21 05:30 +0200
    Re: [PATCH] usb: gadget: f_fs: use memdup_user Michal Nazarewicz <mina86@mina86.com> - 2017-05-14 13:40 +0200

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