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USB: iowarrior: use memdup_user 

Use memdup_user() helper instead of open-coding to simplify the code.

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Reviewed-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Geliang Tang 2017-05-13 11:16:00 +08:00 committed by Greg Kroah-Hartman
parent 2aa3add0cc
commit ca2ef0d5cd
1 changed files with 3 additions and 8 deletions
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11
drivers/usb/misc/iowarrior.c
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@ -368,14 +368,9 @@ static ssize_t iowarrior_write(struct file *file,
case USB_DEVICE_ID_CODEMERCS_IOWPV2:
case USB_DEVICE_ID_CODEMERCS_IOW40:
/* IOW24 and IOW40 use a synchronous call */
buf = kmalloc(count, GFP_KERNEL);
if (!buf) {
retval = -ENOMEM;
goto exit;
}
if (copy_from_user(buf, user_buffer, count)) {
retval = -EFAULT;
kfree(buf);
buf = memdup_user(user_buffer, count);
if (IS_ERR(buf)) {
retval = PTR_ERR(buf);
goto exit;
}
retval = usb_set_report(dev->interface, 2, 0, buf, count);