ax25: Add missing dev_put in ax25_setsockopt

ax25_setsockopt SO_BINDTODEVICE is missing a dev_put call in case of
success.  Re-order code to fix this bug.  While at it also reformat two
lines of code to comply with the Linux coding style.

Initial patch by Jarek Poplawski <jarkao2@gmail.com>.

Reported-by: Bernard Pidoux F6BVP <f6bvp@free.fr>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 10 insertions, 9 deletions

diff --git a/net/ax25/af_ax25.c b/net/ax25/af_ax25.c
index fbcac76fdc0..4102de1022e 100644
--- a/net/ax25/af_ax25.c
+++ b/net/ax25/af_ax25.c
@@ -641,15 +641,10 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
 
         case SO_BINDTODEVICE:
                 if (optlen > IFNAMSIZ)
-                        optlen=IFNAMSIZ;
-                if (copy_from_user(devname, optval, optlen)) {
-                res = -EFAULT;
-                        break;
-                }
+                        optlen = IFNAMSIZ;
 
-                dev = dev_get_by_name(&init_net, devname);
-                if (dev == NULL) {
-                        res = -ENODEV;
+                if (copy_from_user(devname, optval, optlen)) {
+                        res = -EFAULT;
                         break;
                 }
 
@@ -657,12 +652,18 @@ static int ax25_setsockopt(struct socket *sock, int level, int optname,
                    (sock->state != SS_UNCONNECTED ||
                     sk->sk_state == TCP_LISTEN)) {
                         res = -EADDRNOTAVAIL;
-                        dev_put(dev);
+                        break;
+                }
+
+                dev = dev_get_by_name(&init_net, devname);
+                if (!dev) {
+                        res = -ENODEV;
                         break;
                 }
 
                 ax25->ax25_dev = ax25_dev_ax25dev(dev);
                 ax25_fillin_cb(ax25, ax25->ax25_dev);
+                dev_put(dev);
                 break;
 
         default: