aboutsummaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
authorNicolas Dichtel <nicolas.dichtel@6wind.com>2019-07-15 12:00:20 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-12-13 08:52:41 +0100
commitf04f067aaa38246cc8d7392ee27da80ed8d19289 (patch)
treefc8932b65d3c32694716d766fc077705cb60746a
parent28655c632ee0090ae01576e234118ee983a4afa3 (diff)
downloadlinux-yocto-f04f067aaa38246cc8d7392ee27da80ed8d19289.tar.gz
linux-yocto-f04f067aaa38246cc8d7392ee27da80ed8d19289.tar.bz2
linux-yocto-f04f067aaa38246cc8d7392ee27da80ed8d19289.zip
xfrm interface: avoid corruption on changelink
commit e9e7e85d75f3731079ffd77c1a66f037aef04fe7 upstream. The new parameters must not be stored in the netdev_priv() before validation, it may corrupt the interface. Note also that if data is NULL, only a memset() is done. $ ip link add xfrm1 type xfrm dev lo if_id 1 $ ip link add xfrm2 type xfrm dev lo if_id 2 $ ip link set xfrm1 type xfrm dev lo if_id 2 RTNETLINK answers: File exists $ ip -d link list dev xfrm1 5: xfrm1@lo: <NOARP> mtu 1500 qdisc noop state DOWN mode DEFAULT group default qlen 1000 link/none 00:00:00:00:00:00 brd 00:00:00:00:00:00 promiscuity 0 minmtu 68 maxmtu 1500 xfrm if_id 0x2 addrgenmode eui64 numtxqueues 1 numrxqueues 1 gso_max_size 65536 gso_max_segs 65535 => "if_id 0x2" Fixes: f203b76d7809 ("xfrm: Add virtual xfrm interfaces") Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com> Tested-by: Julien Floret <julien.floret@6wind.com> Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--net/xfrm/xfrm_interface.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index e1265fda3035..c811158b9f1c 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -674,12 +674,12 @@ static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
- struct xfrm_if *xi = netdev_priv(dev);
struct net *net = dev_net(dev);
+ struct xfrm_if_parms p;
+ struct xfrm_if *xi;
- xfrmi_netlink_parms(data, &xi->p);
-
- xi = xfrmi_locate(net, &xi->p);
+ xfrmi_netlink_parms(data, &p);
+ xi = xfrmi_locate(net, &p);
if (!xi) {
xi = netdev_priv(dev);
} else {
@@ -687,7 +687,7 @@ static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
return -EEXIST;
}
- return xfrmi_update(xi, &xi->p);
+ return xfrmi_update(xi, &p);
}
static size_t xfrmi_get_size(const struct net_device *dev)