netdev - [PATCH v2 1/1] net:ipv6: check return value of pskb

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Message-Id: <20230717144519.21740-1-ruc_gongyuanjun@163.com>
Date: Mon, 17 Jul 2023 22:45:19 +0800
From: Yuanjun Gong <ruc_gongyuanjun@....com>
To: Yuanjun Gong <ruc_gongyuanjun@....com>,
	"David S . Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	netdev@...r.kernel.org
Subject: [PATCH v2 1/1] net:ipv6: check return value of pskb_trim()

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

Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@....com>
---
 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 da80974ad23a..070d87abf7c0 100644
--- a/net/ipv6/ip6_gre.c
+++ b/net/ipv6/ip6_gre.c
@@ -955,7 +955,8 @@ 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;
 	}
 
-- 
2.17.1