netdev - [PATCH v2] can: Use common error handling code in vxcan

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <23fbbdba-fb11-a6bc-7d6a-4af43ef79503@users.sourceforge.net>
Date:   Wed, 1 Nov 2017 15:16:59 +0100
From:   SF Markus Elfring <elfring@...rs.sourceforge.net>
To:     Marc Kleine-Budde <mkl@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        linux-can@...r.kernel.org,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        kernel-janitors@...r.kernel.org
Subject: [PATCH v2] can: Use common error handling code in vxcan_newlink()

From: Markus Elfring <elfring@...rs.sourceforge.net>
Date: Wed, 1 Nov 2017 14:56:15 +0100

Add a jump target so that a bit of exception handling can be better reused
at the end of this function.

This issue was detected by using the Coccinelle software.

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
---

v2:
An approach to make two checks for a failure predicate a bit safer
was rejected on 2017-10-28.
The possibility remains to reconsider such an adjustment later again.
https://lkml.org/lkml/2017/10/28/125
https://lkml.kernel.org/r/<264b3c2b-8354-5769-639c-ac8d2fcbe630@...tkopp.net>

 drivers/net/can/vxcan.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/net/can/vxcan.c b/drivers/net/can/vxcan.c
index 8404e8852a0f..5d1753cfacea 100644
--- a/drivers/net/can/vxcan.c
+++ b/drivers/net/can/vxcan.c
@@ -227,10 +227,8 @@ static int vxcan_newlink(struct net *net, struct net_device *dev,
 	netif_carrier_off(peer);
 
 	err = rtnl_configure_link(peer, ifmp);
-	if (err < 0) {
-		unregister_netdevice(peer);
-		return err;
-	}
+	if (err < 0)
+		goto unregister_network_device;
 
 	/* register first device */
 	if (tb[IFLA_IFNAME])
@@ -239,10 +237,8 @@ static int vxcan_newlink(struct net *net, struct net_device *dev,
 		snprintf(dev->name, IFNAMSIZ, DRV_NAME "%%d");
 
 	err = register_netdevice(dev);
-	if (err < 0) {
-		unregister_netdevice(peer);
-		return err;
-	}
+	if (err < 0)
+		goto unregister_network_device;
 
 	netif_carrier_off(dev);
 
@@ -254,6 +250,10 @@ static int vxcan_newlink(struct net *net, struct net_device *dev,
 	rcu_assign_pointer(priv->peer, dev);
 
 	return 0;
+
+unregister_network_device:
+	unregister_netdevice(peer);
+	return err;
 }
 
 static void vxcan_dellink(struct net_device *dev, struct list_head *head)
-- 
2.14.3