[NET]: Fix ipx/econet/appletalk/irda ioctl crashes

Fix kernel oopses whenever somebody issues compatible ioctl on AppleTalk,
Econet, IPX or IRDA socket.  For AppleTalk/Econet/IRDA it restores state
in which these sockets were before compat_ioctl was introduced to the socket
ops, for IPX it implements support for 4 ioctls which were not implemented
before - as these ioctls use structures which match between 32bit and 64bit
userspace, no special code is needed, just call 64bit ioctl handler.

Signed-off-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 26 insertions, 0 deletions

diff --git a/net/ipx/af_ipx.c b/net/ipx/af_ipx.c
index 0fb513a34d11..2dbf134d5266 100644
--- a/net/ipx/af_ipx.c
+++ b/net/ipx/af_ipx.c
@@ -1892,6 +1892,29 @@ static int ipx_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
         return rc;
 }
 
+
+#ifdef CONFIG_COMPAT
+static int ipx_compat_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
+{
+        /*
+         * These 4 commands use same structure on 32bit and 64bit.  Rest of IPX
+         * commands is handled by generic ioctl code.  As these commands are
+         * SIOCPROTOPRIVATE..SIOCPROTOPRIVATE+3, they cannot be handled by generic
+         * code.
+         */
+        switch (cmd) {
+        case SIOCAIPXITFCRT:
+        case SIOCAIPXPRISLT:
+        case SIOCIPXCFGDATA:
+        case SIOCIPXNCPCONN:
+                return ipx_ioctl(sock, cmd, arg);
+        default:
+                return -ENOIOCTLCMD;
+        }
+}
+#endif
+
+
 /*
  * Socket family declarations
  */
@@ -1913,6 +1936,9 @@ static const struct proto_ops SOCKOPS_WRAPPED(ipx_dgram_ops) = {
         .getname        = ipx_getname,
         .poll           = datagram_poll,
         .ioctl          = ipx_ioctl,
+#ifdef CONFIG_COMPAT
+        .compat_ioctl   = ipx_compat_ioctl,
+#endif
         .listen         = sock_no_listen,
         .shutdown       = sock_no_shutdown, /* FIXME: support shutdown */
         .setsockopt     = ipx_setsockopt,