This is a note to let you know that I've just added the patch titled udp: using datalen to cap ipv6 udp 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-ipv6-udp-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. commit 470ed62ae1ac8baa185701d597a8315a98ca6353 Author: Coco Li <lixiaoyan@xxxxxxxxxx> Date: Thu Dec 23 22:24:40 2021 +0000 udp: using datalen to cap ipv6 udp max gso segments [ Upstream commit 736ef37fd9a44f5966e25319d08ff7ea99ac79e8 ] The max number of UDP gso segments is intended to cap to UDP_MAX_SEGMENTS, this is checked in udp_send_skb(). skb->len contains network and transport header len here, we should use only data len instead. This is the ipv6 counterpart to the below referenced commit, which missed the ipv6 change Fixes: 158390e45612 ("udp: using datalen to cap max gso segments") Signed-off-by: Coco Li <lixiaoyan@xxxxxxxxxx> Reviewed-by: Willem de Bruijn <willemb@xxxxxxxxxx> Link: https://lore.kernel.org/r/20211223222441.2975883-1-lixiaoyan@xxxxxxxxxx Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 0198910c2bf27..7d3caafdf2059 100644 --- a/net/ipv6/udp.c +++ b/net/ipv6/udp.c @@ -1069,7 +1069,7 @@ static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, 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; }