netdev - [PATCH] xfrm: ipcomp: Call pskb_may_pull in ipcomp

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Message-ID: <Z9KTIYVFwEIYXgd7@gondor.apana.org.au>
Date: Thu, 13 Mar 2025 16:11:13 +0800
From: Herbert Xu <herbert@...dor.apana.org.au>
To: Steffen Klassert <steffen.klassert@...unet.com>, netdev@...r.kernel.org
Subject: [PATCH] xfrm: ipcomp: Call pskb_may_pull in ipcomp_input

If a malformed packet is received there may not be enough data
to pull.

Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
---
 net/xfrm/xfrm_ipcomp.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
index 9c0fa0e1786a..43eae94e4b0e 100644
--- a/net/xfrm/xfrm_ipcomp.c
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -97,6 +97,9 @@ int ipcomp_input(struct xfrm_state *x, struct sk_buff *skb)
 	int err = -ENOMEM;
 	struct ip_comp_hdr *ipch;
 
+	if (!pskb_may_pull(skb, sizeof(*ipch)))
+		return -EINVAL;
+
 	if (skb_linearize_cow(skb))
 		goto out;
 
-- 
2.39.5

-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt