5.15-stable review patch. If anyone has any objections, please let me know.
------------------
From: Felix Fietkau nbd@nbd.name
commit b128ed5ab27330deeeaf51ea8bb69f1442a96f7f upstream.
When assembling fraglist GSO packets, udp4_gro_complete does not set skb->csum_start, which makes the extra validation in __udp_gso_segment fail.
Fixes: 89add40066f9 ("net: drop bad gso csum_start and offset in virtio_net_hdr") Signed-off-by: Felix Fietkau nbd@nbd.name Reviewed-by: Willem de Bruijn willemb@google.com Link: https://patch.msgid.link/20240819150621.59833-1-nbd@nbd.name Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv4/udp_offload.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
--- a/net/ipv4/udp_offload.c +++ b/net/ipv4/udp_offload.c @@ -277,7 +277,8 @@ struct sk_buff *__udp_gso_segment(struct return ERR_PTR(-EINVAL);
if (unlikely(skb_checksum_start(gso_skb) != - skb_transport_header(gso_skb))) + skb_transport_header(gso_skb) && + !(skb_shinfo(gso_skb)->gso_type & SKB_GSO_FRAGLIST))) return ERR_PTR(-EINVAL);
if (skb_gso_ok(gso_skb, features | NETIF_F_GSO_ROBUST)) {