netdev - [PATCH 4/6] xfrm: interface with if

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Message-ID: <20220106093606.3046771-5-steffen.klassert@secunet.com>
Date:   Thu, 6 Jan 2022 10:36:04 +0100
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        <netdev@...r.kernel.org>
Subject: [PATCH 4/6] xfrm: interface with if_id 0 should return error

From: Antony Antony <antony.antony@...unet.com>

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@...unet.com>
Reviewed-by: Eyal Birger <eyal.birger@...il.com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
---
 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 41de46b5ffa9..57448fc519fc 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -637,11 +637,16 @@ 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;
@@ -666,7 +671,12 @@ 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);
-- 
2.25.1