[patch] gre: information leak in ip6_tnl_ioctl()
From: Dan Carpenter <hidden>
Date: 2012-08-16 13:15:04
Also in:
kernel-janitors
Subsystem:
networking [general], networking [ipv4/ipv6], the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds
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 c12b395a46 "gre: Support GRE over IPv6". Signed-off-by: Dan Carpenter <redacted> --- This is only needed in linux-next.
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 33d2a0e..cb7e2de 100644
--- 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);