From: Coco Li lixiaoyan@google.com
stable inclusion from linux-4.19.224 commit bbd9c7120c31c1aff6dcffdcce122773d163df72
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[ 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@google.com Reviewed-by: Willem de Bruijn willemb@google.com Link: https://lore.kernel.org/r/20211223222441.2975883-1-lixiaoyan@google.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Yongqiang Liu liuyongqiang13@huawei.com Signed-off-by: Laibin Qiu qiulaibin@huawei.com --- net/ipv6/udp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c index 581763d6df12..3ed5fe0055af 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; }