netdev - [PATCH ipsec] xfrm: fix possible derferencing in error path

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Message-ID: <2a5c46f3ae893a13a9da7176b3d67f3439d9ce1c.1712769898.git.antony.antony@secunet.com>
Date: Wed, 10 Apr 2024 19:27:12 +0200
From: Antony Antony <antony.antony@...unet.com>
To: Steffen Klassert <steffen.klassert@...unet.com>, <netdev@...r.kernel.org>,
	Herbert Xu <herbert@...dor.apana.org.au>
CC: "David S. Miller" <davem@...emloft.net>, Eric Dumazet
	<edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>, Paolo Abeni
	<pabeni@...hat.com>, Antony Antony <antony.antony@...unet.com>, Dan Carpenter
	<dan.carpenter@...aro.org>
Subject: [PATCH ipsec] xfrm: fix possible derferencing in error path

Fix derferencing pointer when xfrm_policy_lookup_bytype returns an
 error.

Fixes: 63b21caba17e ("xfrm: introduce forwarding of ICMP Error messages")
Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
Closes: https://lore.kernel.org/kernel-janitors/f6ef0d0d-96de-4e01-9dc3-c1b3a6338653@moroto.mountain/
Signed-off-by: Antony Antony <antony.antony@...unet.com>
---
 net/xfrm/xfrm_policy.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/xfrm/xfrm_policy.c b/net/xfrm/xfrm_policy.c
index 6affe5cd85d8..53d8fabfa685 100644
--- a/net/xfrm/xfrm_policy.c
+++ b/net/xfrm/xfrm_policy.c
@@ -3593,6 +3593,8 @@ xfrm_policy *xfrm_in_fwd_icmp(struct sk_buff *skb,
 			return pol;

 		pol = xfrm_policy_lookup(net, &fl1, family, XFRM_POLICY_FWD, if_id);
+		if (IS_ERR(pol))
+			pol = NULL;
 	}

 	return pol;
--
2.30.2