linux-kernel - [PATCH 7/9] ipv6: stub out even more of addrconf_set

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Date:   Tue, 19 May 2020 15:03:17 +0200
From:   Christoph Hellwig <hch@....de>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/9] ipv6: stub out even more of addrconf_set_dstaddr if SIT is disabled

There is no point in copying the structure from userspace or looking up
a device if SIT support is not disabled and we'll eventually return
-ENODEV anyway.

Signed-off-by: Christoph Hellwig <hch@....de>
---
 net/ipv6/addrconf.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index ab7e839753aed..8300176f91e74 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2794,6 +2794,9 @@ int addrconf_set_dstaddr(struct net *net, void __user *arg)
 	struct net_device *dev;
 	int err = -EINVAL;
 
+	if (!IS_ENABLED(CONFIG_IPV6_SIT))
+		return -ENODEV;
+
 	rtnl_lock();
 
 	err = -EFAULT;
@@ -2806,7 +2809,6 @@ int addrconf_set_dstaddr(struct net *net, void __user *arg)
 	if (!dev)
 		goto err_exit;
 
-#if IS_ENABLED(CONFIG_IPV6_SIT)
 	if (dev->type == ARPHRD_SIT) {
 		const struct net_device_ops *ops = dev->netdev_ops;
 		struct ifreq ifr;
@@ -2842,7 +2844,6 @@ int addrconf_set_dstaddr(struct net *net, void __user *arg)
 			err = dev_open(dev, NULL);
 		}
 	}
-#endif
 
 err_exit:
 	rtnl_unlock();
-- 
2.26.2