netdev - [PATCH] xfrm: fix the if_id check in changelink

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Message-ID: <ca25f9904d2a4acebdc02b1c054aaeab25d99cc5.1643698195.git.antony.antony@secunet.com>
Date:   Tue, 1 Feb 2022 07:51:57 +0100
From:   Antony Antony <antony.antony@...unet.com>
To:     Steffen Klassert <steffen.klassert@...unet.com>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        Eyal Birger <eyal.birger@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        "Jakub Kicinski" <kuba@...nel.org>, <netdev@...r.kernel.org>,
        <stable@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Antony Antony <antony.antony@...unet.com>
Subject: [PATCH] xfrm: fix the if_id check in changelink

if_id will be always 0, because it was not yet initialized.

Fixes: 8dce43919566 ("xfrm: interface with if_id 0 should return error")
Reported-by: Pavel Machek <pavel@...x.de>
Signed-off-by: Antony Antony <antony.antony@...unet.com>
---
 net/xfrm/xfrm_interface.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index 57448fc519fc..4e3c62d1ad9e 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -673,12 +673,12 @@ static int xfrmi_changelink(struct net_device *dev, struct nlattr *tb[],
 	struct net *net = xi->net;
 	struct xfrm_if_parms p = {};

+	xfrmi_netlink_parms(data, &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);
 	if (!xi) {
 		xi = netdev_priv(dev);
--
2.30.2