netdev - [PATCH ipsec] xfrm: fix dflt policy check when there is no policy configured

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Message-Id: <20211122103313.1331-1-nicolas.dichtel@6wind.com>
Date:   Mon, 22 Nov 2021 11:33:13 +0100
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     steffen.klassert@...unet.com
Cc:     davem@...emloft.net, herbert@...dor.apana.org.au, kuba@...nel.org,
        antony.antony@...unet.com, netdev@...r.kernel.org,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        stable@...r.kernel.org
Subject: [PATCH ipsec] xfrm: fix dflt policy check when there is no policy configured

When there is no policy configured on the system, the default policy is
checked in xfrm_route_forward. However, it was done with the wrong
direction (XFRM_POLICY_FWD instead of XFRM_POLICY_OUT).
The default policy for XFRM_POLICY_FWD was checked just before, with a call
to xfrm[46]_policy_check().

CC: stable@...r.kernel.org
Fixes: 2d151d39073a ("xfrm: Add possibility to set the default to block if we have no policy")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---
 include/net/xfrm.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/net/xfrm.h b/include/net/xfrm.h
index 2308210793a0..55e574511af5 100644
--- a/include/net/xfrm.h
+++ b/include/net/xfrm.h
@@ -1162,7 +1162,7 @@ static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
 {
 	struct net *net = dev_net(skb->dev);
 
-	if (xfrm_default_allow(net, XFRM_POLICY_FWD))
+	if (xfrm_default_allow(net, XFRM_POLICY_OUT))
 		return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
 			(skb_dst(skb)->flags & DST_NOXFRM) ||
 			__xfrm_route_forward(skb, family);
-- 
2.33.0