linux-kernel - [PATCH] net: xfrm: fix return value check in ipcomp

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Message-Id: <20231006114106.3982925-1-make_ruc2021@163.com>
Date:   Fri,  6 Oct 2023 19:41:06 +0800
From:   Ma Ke <make_ruc2021@....com>
To:     steffen.klassert@...unet.com, herbert@...dor.apana.org.au,
        davem@...emloft.net, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ma Ke <make_ruc2021@....com>
Subject: [PATCH] net: xfrm: fix return value check in ipcomp_compress

In ipcomp_compress, to avoid an unexpected result returned by
pskb_trim, we should check the return value of pskb_trim().

Signed-off-by: Ma Ke <make_ruc2021@....com>
---
 net/xfrm/xfrm_ipcomp.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/xfrm/xfrm_ipcomp.c b/net/xfrm/xfrm_ipcomp.c
index 9c0fa0e1786a..5f2e6edadf48 100644
--- a/net/xfrm/xfrm_ipcomp.c
+++ b/net/xfrm/xfrm_ipcomp.c
@@ -144,7 +144,9 @@ static int ipcomp_compress(struct xfrm_state *x, struct sk_buff *skb)
 	memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
 	local_bh_enable();
 
-	pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
+	err = pskb_trim(skb, dlen + sizeof(struct ip_comp_hdr));
+	if (unlikely(err))
+		goto out;
 	return 0;
 
 out:
-- 
2.37.2