[PATCH] yam: use memdup_user

[Geliang Tang]

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

Signed-off-by: Geliang Tang <geliangt...@gmail.com>
---
 drivers/net/hamradio/yam.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/drivers/net/hamradio/yam.c b/drivers/net/hamradio/yam.c
index b6891ad..7a7c522 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;
-- 
2.9.3