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udp: using datalen to cap max gso segments

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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: bec1f6f697 ("udp: generate gso with UDP_SEGMENT")
Signed-off-by: Jianguo Wu <wujianguo@chinatelecom.cn>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Link: https://lore.kernel.org/r/900742e5-81fb-30dc-6e0b-375c6cdd7982@163.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Jianguo Wu 2021-12-08 18:03:33 +08:00 committed by Jakub Kicinski
parent 0416e7af23
commit 158390e456
1 changed files with 1 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
net/ipv4/udp.c
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@ -916,7 +916,7 @@ static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4,
kfree_skb(skb); kfree_skb(skb);
return -EINVAL; return -EINVAL;
} }
if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) { if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) {
kfree_skb(skb); kfree_skb(skb);
return -EINVAL; return -EINVAL;
} }