From: Ma Ke <make_ruc2021@163.com>
Date: Mon, 9 Oct 2023 01:13:37 +0000 (+0800)
Subject: net: ipv4: fix return value check in esp_remove_trailer
X-Git-Tag: v6.1.63~682
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=55d794cef3532ce2a974c37529a9bbd4a4bc1e2f;p=sdk%2Femulator%2Femulator-kernel.git

net: ipv4: fix return value check in esp_remove_trailer

commit 513f61e2193350c7a345da98559b80f61aec4fa6 upstream.

In esp_remove_trailer(), 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@163.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 2d094d417eca..e2546961add3 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -732,7 +732,9 @@ static inline int esp_remove_trailer(struct sk_buff *skb)
 		skb->csum = csum_block_sub(skb->csum, csumdiff,
 					   skb->len - trimlen);
 	}
-	pskb_trim(skb, skb->len - trimlen);
+	ret = pskb_trim(skb, skb->len - trimlen);
+	if (unlikely(ret))
+		return ret;
 
 	ret = nexthdr[1];