gre: information leak in ip6_tnl_ioctl()

There is a one byte hole between p->hop_limit and p->flowinfo where stack memory is leaked to the user. This was introduced in c12b395 "gre: Support GRE over IPv6". Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
git-mirror · Aug 20, 2012 · 5ef5d6c · 5ef5d6c
1 parent 5689226
commit 5ef5d6c
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
@@ -1312,6 +1312,8 @@ ip6_tnl_ioctl(struct net_device *dev, struct ifreq *ifr, int cmd)
 			}
 			ip6_tnl_parm_from_user(&p1, &p);
 			t = ip6_tnl_locate(net, &p1, 0);
+		} else {
+			memset(&p, 0, sizeof(p));
 		}
 		if (t == NULL)
 			t = netdev_priv(dev);