netdev - [PATCH] devinet_ioctl(): Set ret to 0 when breaking out of the switch-case

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Date:   Sun, 28 Jan 2018 20:48:07 -0800
From:   Christoph Paasch <cpaasch@...le.com>
To:     David Miller <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@....de>
Subject: [PATCH] devinet_ioctl(): Set ret to 0 when breaking out of the
 switch-case

Commit 03aef17bb79b ("devinet_ioctl(): take copyin/copyout to caller")
introduced a regression when using ifconfig. ifconfig doesn't show the
address anymore. The reason is that the above patch changed the flow in
devinet_ioctl(), where we break; and end up returning ret. ret however
is set to -EADDRNOTAVAIL, which later on prevents the copy_to_user() in
inet_ioctl().

Thus, when we break in devinet_ioctl() we have to set ret to 0 to
properly return out of devinet_ioctl.

Cc: Al Viro <viro@...iv.linux.org.uk>
Cc: Christoph Hellwig <hch@....de>
Fixes: 03aef17bb79b ("devinet_ioctl(): take copyin/copyout to caller")
Signed-off-by: Christoph Paasch <cpaasch@...le.com>
---
 net/ipv4/devinet.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index e056c0067f2c..942dbc73def0 100644
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -1049,18 +1049,22 @@ int devinet_ioctl(struct net *net, unsigned int cmd, struct ifreq *ifr)
 	switch (cmd) {
 	case SIOCGIFADDR:	/* Get interface address */
 		sin->sin_addr.s_addr = ifa->ifa_local;
+		ret = 0;
 		break;
 
 	case SIOCGIFBRDADDR:	/* Get the broadcast address */
 		sin->sin_addr.s_addr = ifa->ifa_broadcast;
+		ret = 0;
 		break;
 
 	case SIOCGIFDSTADDR:	/* Get the destination address */
 		sin->sin_addr.s_addr = ifa->ifa_address;
+		ret = 0;
 		break;
 
 	case SIOCGIFNETMASK:	/* Get the netmask for the interface */
 		sin->sin_addr.s_addr = ifa->ifa_mask;
+		ret = 0;
 		break;
 
 	case SIOCSIFFLAGS:
-- 
2.16.1