linux-kernel - [PATCH AUTOSEL 4.19 02/12] net: ipv6: fix return value check in esp_remove

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Message-ID: <20231029230135.793281-2-sashal@kernel.org>
Date:   Sun, 29 Oct 2023 19:01:15 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ma Ke <make_ruc2021@....com>,
        Steffen Klassert <steffen.klassert@...unet.com>,
        Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
        dsahern@...nel.org, edumazet@...gle.com, kuba@...nel.org,
        pabeni@...hat.com, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 02/12] net: ipv6: fix return value check in esp_remove_trailer

From: Ma Ke <make_ruc2021@....com>

[ Upstream commit dad4e491e30b20f4dc615c9da65d2142d703b5c2 ]

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@....com>
Signed-off-by: Steffen Klassert <steffen.klassert@...unet.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 net/ipv6/esp6.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index d847ffbe97451..6529e46ad0914 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -517,7 +517,9 @@ 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];
 
-- 
2.42.0