netdev - [PATCH net 3/4] net: socket: fix SIOCGIFNAME in compat

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Date:   Fri, 25 Jan 2019 22:43:19 +0100
From:   Johannes Berg <johannes@...solutions.net>
To:     netdev@...r.kernel.org
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Robert O'Callahan <robert@...llahan.org>,
        Johannes Berg <johannes.berg@...el.com>
Subject: [PATCH net 3/4] net: socket: fix SIOCGIFNAME in compat

From: Johannes Berg <johannes.berg@...el.com>

As reported by Robert O'Callahan in
https://bugzilla.kernel.org/show_bug.cgi?id=202273
reverting the previous changes in this area broke
the SIOCGIFNAME ioctl in compat again (I'd previously
fixed it after his previous report of breakage in
https://bugzilla.kernel.org/show_bug.cgi?id=199469).

This is obviously because I fixed SIOCGIFNAME more or
less by accident.

Fix it explicitly now by making it pass through the
restored compat translation code.

Cc: stable@...r.kernel.org
Fixes: 4cf808e7ac32 ("kill dev_ifname32()")
Reported-by: Robert O'Callahan <robert@...llahan.org>
Signed-off-by: Johannes Berg <johannes.berg@...el.com>
---
 net/socket.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/socket.c b/net/socket.c
index fbf80f9fb057..473ac8d7c54e 100644
--- a/net/socket.c
+++ b/net/socket.c
@@ -3029,6 +3029,7 @@ static int compat_ifreq_ioctl(struct net *net, struct socket *sock,
 		case SIOCGIFTXQLEN:
 		case SIOCGMIIPHY:
 		case SIOCGMIIREG:
+		case SIOCGIFNAME:
 			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
 				err = -EFAULT;
 			break;
@@ -3252,6 +3253,7 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 	case SIOCSIFTXQLEN:
 	case SIOCBRADDIF:
 	case SIOCBRDELIF:
+	case SIOCGIFNAME:
 	case SIOCSIFNAME:
 	case SIOCGMIIPHY:
 	case SIOCGMIIREG:
@@ -3266,7 +3268,6 @@ static int compat_sock_ioctl_trans(struct file *file, struct socket *sock,
 	case SIOCBONDRELEASE:
 	case SIOCBONDSETHWADDR:
 	case SIOCBONDCHANGEACTIVE:
-	case SIOCGIFNAME:
 		return sock_do_ioctl(net, sock, cmd, arg);
 	}
 
-- 
2.17.2