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| author | Nicolas Dichtel <nicolas.dichtel@6wind.com> | 2019-07-15 13:00:20 +0300 |
|---|---|---|
| committer | Steffen Klassert <steffen.klassert@secunet.com> | 2019-07-17 11:03:54 +0300 |
| commit | e9e7e85d75f3731079ffd77c1a66f037aef04fe7 (patch) | |
| tree | 65f27b789ff1758a4eea9a5942c283cad8bf97f0 /net | |
| parent | 114a5c3240155fdb01bf821c9d326d7bb05bd464 (diff) | |
| download | linux-e9e7e85d75f3731079ffd77c1a66f037aef04fe7.tar.xz | |
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')
| -rw-r--r-- | net/xfrm/xfrm_interface.c | 10 |
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) |