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SubjectRe: [PATCH] usb: gadget: f_fs: use memdup_user
On Sat, May 13, 2017 at 11:15:59AM +0800, Geliang Tang wrote:
> Use memdup_user() helper instead of open-coding to simplify the code.
>
> Signed-off-by: Geliang Tang <geliangtang@gmail.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)))

Don't use likely/unlikely() here. It's not a fast path.

regards,
dan carpenter


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