netdev - [PATCH] udp: using datalen to cap max gso segments

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Message-ID: <900742e5-81fb-30dc-6e0b-375c6cdd7982@163.com>
Date:   Wed, 8 Dec 2021 18:03:33 +0800
From:   Jianguo Wu <wujianguo106@....com>
To:     netdev@...r.kernel.org
Cc:     willemb@...gle.com, davem@...emloft.net
Subject: [PATCH] udp: using datalen to cap max gso segments

From: Jianguo Wu <wujianguo@...natelecom.cn>

The max number of UDP gso segments is intended to cap to UDP_MAX_SEGMENTS,
this is checked in udp_send_skb():

    if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
        kfree_skb(skb);
        return -EINVAL;
    }

skb->len contains network and transport header len here, we should use
only data len instead.

Fixes: bec1f6f69736 ("udp: generate gso with UDP_SEGMENT")
Signed-off-by: Jianguo Wu <wujianguo@...natelecom.cn>
---
 net/ipv4/udp.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 8bcecdd6aeda..23b05e28490b 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -916,7 +916,7 @@ static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4,
 			kfree_skb(skb);
 			return -EINVAL;
 		}
-		if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) {
+		if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) {
 			kfree_skb(skb);
 			return -EINVAL;
 		}
-- 
1.8.3.1