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Subject[PATCH 5.10 173/563] xfrm: interface with if_id 0 should return error
Date
From: Antony Antony <antony.antony@secunet.com>

[ Upstream commit 8dce43919566f06e865f7e8949f5c10d8c2493f5 ]

xfrm interface if_id = 0 would cause xfrm policy lookup errors since
Commit 9f8550e4bd9d.

Now explicitly fail to create an xfrm interface when if_id = 0

With this commit:
ip link add ipsec0 type xfrm dev lo if_id 0
Error: if_id must be non zero.

v1->v2 change:
- add Fixes: tag

Fixes: 9f8550e4bd9d ("xfrm: fix disable_xfrm sysctl when used on xfrm interfaces")
Signed-off-by: Antony Antony <antony.antony@secunet.com>
Reviewed-by: Eyal Birger <eyal.birger@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
net/xfrm/xfrm_interface.c | 14 ++++++++++++--
1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index e9ce23343f5ca..e1fae61a5bb90 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -643,11 +643,16 @@ static int xfrmi_newlink(struct net *src_net, struct net_device *dev,
struct netlink_ext_ack *extack)
{
struct net *net = dev_net(dev);
- struct xfrm_if_parms p;
+ struct xfrm_if_parms p = {};
struct xfrm_if *xi;
int err;

xfrmi_netlink_parms(data, &p);
+ if (!p.if_id) {
+ NL_SET_ERR_MSG(extack, "if_id must be non zero");
+ return -EINVAL;
+ }
+
xi = xfrmi_locate(net, &p);
if (xi)
return -EEXIST;
@@ -672,7 +677,12 @@ static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
{
struct xfrm_if *xi = netdev_priv(dev);
struct net *net = xi->net;
- struct xfrm_if_parms p;
+ struct xfrm_if_parms p = {};
+
+ if (!p.if_id) {
+ NL_SET_ERR_MSG(extack, "if_id must be non zero");
+ return -EINVAL;
+ }

xfrmi_netlink_parms(data, &p);
xi = xfrmi_locate(net, &p);
--
2.34.1


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