net/appletalk: fix minor pointer leak to userspace in SIOCFINDIPDDPRT

Fields ->dev and ->next of struct ipddp_route may be copied to
userspace on the SIOCFINDIPDDPRT ioctl. This is only accessible
to CAP_NET_ADMIN though. Let's manually copy the relevant fields
instead of using memcpy().

BugLink: http://blog.infosectcbr.com.au/2018/09/linux-kernel-infoleaks.html
Cc: Jann Horn <jannh@google.com>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/appletalk/ipddp.c b/drivers/net/appletalk/ipddp.c
index 9375cef..3d27616 100644 (file)
--- a/drivers/net/appletalk/ipddp.c
+++ b/drivers/net/appletalk/ipddp.c
@@ -283,8 +283,12 @@ static int ipddp_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
                 case SIOCFINDIPDDPRT:
                        spin_lock_bh(&ipddp_route_lock);
                        rp = __ipddp_find_route(&rcp);
-                       if (rp)
-                               memcpy(&rcp2, rp, sizeof(rcp2));
+                       if (rp) {
+                               memset(&rcp2, 0, sizeof(rcp2));
+                               rcp2.ip    = rp->ip;
+                               rcp2.at    = rp->at;
+                               rcp2.flags = rp->flags;
+                       }
                        spin_unlock_bh(&ipddp_route_lock);
 
                        if (rp) {