From 0c0bd9789a8d2af1d217327c7292b9d737475482 Mon Sep 17 00:00:00 2001
From: Yuanjun Gong <ruc_gongyuanjun@163.com>
Date: Mon, 17 Jul 2023 22:45:19 +0800
Subject: [PATCH] net:ipv6: check return value of pskb_trim()

[ Upstream commit 4258faa130be4ea43e5e2d839467da421b8ff274 ]

goto tx_err if an unexpected result is returned by pskb_tirm()
in ip6erspan_tunnel_xmit().

Fixes: 5a963eb61b7c ("ip6_gre: Add ERSPAN native tunnel support")
Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
Reviewed-by: David Ahern <dsahern@kernel.org>
Reviewed-by: Kuniyuki Iwashima <kuniyu@amazon.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 net/ipv6/ip6_gre.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv6/ip6_gre.c b/net/ipv6/ip6_gre.c
index 0977137b00dc..2d34bd98fcce 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -941,7 +941,8 @@ static netdev_tx_t ip6erspan_tunnel_xmit(struct sk_buff *skb,
 		goto tx_err;
 
 	if (skb->len > dev->mtu + dev->hard_header_len) {
-		pskb_trim(skb, dev->mtu + dev->hard_header_len);
+		if (pskb_trim(skb, dev->mtu + dev->hard_header_len))
+			goto tx_err;
 		truncate = true;
 	}