netdev - [PATCH net] udp: fix receiving fraglist GSO packets

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Message-ID: <20240819150621.59833-1-nbd@nbd.name>
Date: Mon, 19 Aug 2024 17:06:21 +0200
From: Felix Fietkau <nbd@....name>
To: netdev@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	David Ahern <dsahern@...nel.org>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Willem de Bruijn <willemb@...gle.com>
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH net] udp: fix receiving fraglist GSO packets

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@....name>
---
 net/ipv4/udp_offload.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/udp_offload.c b/net/ipv4/udp_offload.c
index b254a5dadfcf..d842303587af 100644
--- a/net/ipv4/udp_offload.c
+++ b/net/ipv4/udp_offload.c
@@ -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);
 
 	/* We don't know if egress device can segment and checksum the packet
-- 
2.46.0