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authorNicolas Dichtel <nicolas.dichtel@6wind.com>2019-07-15 12:00:20 +0200
committerSteffen Klassert <steffen.klassert@secunet.com>2019-07-17 10:03:54 +0200
commite9e7e85d75f3731079ffd77c1a66f037aef04fe7 (patch)
tree65f27b789ff1758a4eea9a5942c283cad8bf97f0 /net/xfrm/xfrm_interface.c
parent114a5c3240155fdb01bf821c9d326d7bb05bd464 (diff)
xfrm interface: avoid corruption on changelink
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>
Diffstat (limited to 'net/xfrm/xfrm_interface.c')
-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 74868f9d81fb..2310dc9e35c2 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -671,12 +671,12 @@ 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 {
@@ -684,7 +684,7 @@ 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)