netdev - [PATCH] mkiss: Fix error handling in mkiss

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Message-ID: <1439227363-6737-1-git-send-email-fabio.estevam@freescale.com>
Date:	Mon, 10 Aug 2015 14:22:43 -0300
From:	Fabio Estevam <fabio.estevam@...escale.com>
To:	<davem@...emloft.net>
CC:	<netdev@...r.kernel.org>, <zy900702@....com>,
	Fabio Estevam <fabio.estevam@...escale.com>
Subject: [PATCH] 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@....com>
Signed-off-by: Fabio Estevam <fabio.estevam@...escale.com>
---
 drivers/net/hamradio/mkiss.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c
index 2ffbf13..216bfd3 100644
--- 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 */
-- 
1.9.1

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