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yam: use memdup_user

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

Signed-off-by: Geliang Tang <geliangtang@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Geliang Tang 2017-05-06 23:42:22 +08:00 committed by David S. Miller
parent 294316a4af
commit 871ff2ebe0
1 changed files with 4 additions and 6 deletions
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10
drivers/net/hamradio/yam.c
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@ -976,12 +976,10 @@ static int yam_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
case SIOCYAMSMCS:
if (netif_running(dev))
return -EINVAL; /* Cannot change this parameter when up */
if ((ym = kmalloc(sizeof(struct yamdrv_ioctl_mcs), GFP_KERNEL)) == NULL)
return -ENOBUFS;
if (copy_from_user(ym, ifr->ifr_data, sizeof(struct yamdrv_ioctl_mcs))) {
kfree(ym);
return -EFAULT;
}
ym = memdup_user(ifr->ifr_data,
sizeof(struct yamdrv_ioctl_mcs));
if (IS_ERR(ym))
return PTR_ERR(ym);
if (ym->bitrate > YAM_MAXBITRATE) {
kfree(ym);
return -EINVAL;