[PATCH 4.20 136/183] net: socket: fix SIOCGIFNAME in compat

[Greg Kroah-Hartman]

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johannes Berg <johannes.berg@xxxxxxxxx>

[ Upstream commit c6c9fee35dc27362b7bac34b2fc9f5b8ace2e22c ]

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@xxxxxxxxxxxxxxx
Fixes: 4cf808e7ac32 ("kill dev_ifname32()")
Reported-by: Robert O'Callahan <robert@xxxxxxxxxxxxx>
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/socket.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/net/socket.c
+++ b/net/socket.c
@@ -2999,6 +2999,7 @@ static int compat_ifreq_ioctl(struct net
 		case SIOCGIFTXQLEN:
 		case SIOCGMIIPHY:
 		case SIOCGMIIREG:
+		case SIOCGIFNAME:
 			if (copy_in_user(uifr32, uifr, sizeof(*uifr32)))
 				err = -EFAULT;
 			break;
@@ -3222,6 +3223,7 @@ static int compat_sock_ioctl_trans(struc
 	case SIOCSIFTXQLEN:
 	case SIOCBRADDIF:
 	case SIOCBRDELIF:
+	case SIOCGIFNAME:
 	case SIOCSIFNAME:
 	case SIOCGMIIPHY:
 	case SIOCGMIIREG:
@@ -3236,7 +3238,6 @@ static int compat_sock_ioctl_trans(struc
 	case SIOCBONDRELEASE:
 	case SIOCBONDSETHWADDR:
 	case SIOCBONDCHANGEACTIVE:
-	case SIOCGIFNAME:
 		return sock_do_ioctl(net, sock, cmd, arg);
 	}