mkiss: Fix error handling in mkiss_open()

If register_netdev() fails we are not propagating the error and
we return success because ax_open() succeeded previously.

Fix this by checking the return value of ax_open() and
register_netdev() and propagate the error in case of failure.

Reported-by: RUC_Soft_Sec <zy900702@163.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 2ffbf13..216bfd3 100644 (file)
--- a/drivers/net/hamradio/mkiss.c
+++ b/drivers/net/hamradio/mkiss.c
@@ -728,11 +728,12 @@ static int mkiss_open(struct tty_struct *tty)
        dev->type = ARPHRD_AX25;
 
        /* Perform the low-level AX25 initialization. */
-       if ((err = ax_open(ax->dev))) {
+       err = ax_open(ax->dev);
+       if (err)
                goto out_free_netdev;
-       }
 
-       if (register_netdev(dev))
+       err = register_netdev(dev);
+       if (err)
                goto out_free_buffers;
 
        /* after register_netdev() - because else printk smashes the kernel */