yam: use memdup_user

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>

1 files changed, 4 insertions, 6 deletions

diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index b6891ada1d7b..7a7c5224a336 100644
--- a/drivers/net/hamradio/yam.c
+++ b/drivers/net/hamradio/yam.c
@@ -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;