rose: device refcount leak

While hunting dev_put() for net-next-2.6, I found a device refcount
leak in ROSE, ioctl(SIOCADDRT) error path.

Fix is to not touch device refcount, as we hold RTNL

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/rose/rose_route.c b/net/rose/rose_route.c
index 9478d9b..f3e2198 100644 (file)
--- a/net/rose/rose_route.c
+++ b/net/rose/rose_route.c
@@ -578,18 +578,18 @@ static int rose_clear_routes(void)
 
 /*
  *     Check that the device given is a valid AX.25 interface that is "up".
+ *     called whith RTNL
  */
-static struct net_device *rose_ax25_dev_get(char *devname)
+static struct net_device *rose_ax25_dev_find(char *devname)
 {
        struct net_device *dev;
 
-       if ((dev = dev_get_by_name(&init_net, devname)) == NULL)
+       if ((dev = __dev_get_by_name(&init_net, devname)) == NULL)
                return NULL;
 
        if ((dev->flags & IFF_UP) && dev->type == ARPHRD_AX25)
                return dev;
 
-       dev_put(dev);
        return NULL;
 }
 
@@ -720,27 +720,23 @@ int rose_rt_ioctl(unsigned int cmd, void __user *arg)
        case SIOCADDRT:
                if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
                        return -EFAULT;
-               if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
+               if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
                        return -EINVAL;
-               if (rose_dev_exists(&rose_route.address)) { /* Can't add routes to ourself */
-                       dev_put(dev);
+               if (rose_dev_exists(&rose_route.address)) /* Can't add routes to ourself */
                        return -EINVAL;
-               }
                if (rose_route.mask > 10) /* Mask can't be more than 10 digits */
                        return -EINVAL;
                if (rose_route.ndigis > AX25_MAX_DIGIS)
                        return -EINVAL;
                err = rose_add_node(&rose_route, dev);
-               dev_put(dev);
                return err;
 
        case SIOCDELRT:
                if (copy_from_user(&rose_route, arg, sizeof(struct rose_route_struct)))
                        return -EFAULT;
-               if ((dev = rose_ax25_dev_get(rose_route.device)) == NULL)
+               if ((dev = rose_ax25_dev_find(rose_route.device)) == NULL)
                        return -EINVAL;
                err = rose_del_node(&rose_route, dev);
-               dev_put(dev);
                return err;
 
        case SIOCRSCLRRT: