From 158390e45612ef0fde160af0826f1740c36daf21 Mon Sep 17 00:00:00 2001 From: Jianguo Wu Date: Wed, 8 Dec 2021 18:03:33 +0800 Subject: [PATCH] udp: using datalen to cap max gso segments 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 Reviewed-by: Willem de Bruijn Link: https://lore.kernel.org/r/900742e5-81fb-30dc-6e0b-375c6cdd7982@163.com Signed-off-by: Jakub Kicinski --- 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; }