This is a note to let you know that I've just added the patch titled
udp: using datalen to cap max gso segments
to the 4.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
udp-using-datalen-to-cap-max-gso-segments.patch
and it can be found in the queue-4.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 158390e45612ef0fde160af0826f1740c36daf21 Mon Sep 17 00:00:00 2001
From: Jianguo Wu <wujianguo@xxxxxxxxxxxxxxx>
Date: Wed, 8 Dec 2021 18:03:33 +0800
Subject: udp: using datalen to cap max gso segments
From: Jianguo Wu <wujianguo@xxxxxxxxxxxxxxx>
commit 158390e45612ef0fde160af0826f1740c36daf21 upstream.
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@xxxxxxxxxxxxxxx>
Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx>
Link: https://lore.kernel.org/r/900742e5-81fb-30dc-6e0b-375c6cdd7982@xxxxxxx
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/udp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -798,7 +798,7 @@ static int udp_send_skb(struct sk_buff *
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;
}
Patches currently in stable-queue which might be from wujianguo@xxxxxxxxxxxxxxx are
queue-4.19/udp-using-datalen-to-cap-max-gso-segments.patch
