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udp: fix receiving fraglist GSO packets 

[ Upstream commit b128ed5ab27330deeeaf51ea8bb69f1442a96f7f ]

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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Felix Fietkau 2024-08-19 17:06:21 +02:00 committed by Greg Kroah-Hartman
parent 577d6c0619
commit cfa692e7e7
1 changed files with 2 additions and 1 deletions
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3
net/ipv4/udp_offload.c
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@ -279,7 +279,8 @@ struct sk_buff *__udp_gso_segment(struct sk_buff *gso_skb,
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)) {