Commit 0dab7eb8 authored by Willem de Bruijn's avatar Willem de Bruijn Committed by Greg Kroah-Hartman

net: avoid false positives in untrusted gso validation

commit 9e8db591 upstream.

GSO packets with vnet_hdr must conform to a small set of gso_types.
The below commit uses flow dissection to drop packets that do not.

But it has false positives when the skb is not fully initialized.
Dissection needs skb->protocol and skb->network_header.

Infer skb->protocol from gso_type as the two must agree.
SKB_GSO_UDP can use both ipv4 and ipv6, so try both.

Exclude callers for which network header offset is not known.

Fixes: d5be7f63 ("net: validate untrusted gso packets without csum offload")
Signed-off-by: default avatarWillem de Bruijn <[email protected]>
Signed-off-by: default avatarDavid S. Miller <[email protected]>
Signed-off-by: default avatarGreg Kroah-Hartman <[email protected]>
parent f709f7b2
......@@ -61,10 +61,20 @@ static inline int virtio_net_hdr_to_skb(struct sk_buff *skb,
/* gso packets without NEEDS_CSUM do not set transport_offset.
* probe and drop if does not match one of the above types.
if (gso_type) {
if (gso_type && skb->network_header) {
if (!skb->protocol)
virtio_net_hdr_set_proto(skb, hdr);
skb_probe_transport_header(skb, -1);
if (!skb_transport_header_was_set(skb))
if (!skb_transport_header_was_set(skb)) {
/* UFO does not specify ipv4 or 6: try both */
if (gso_type & SKB_GSO_UDP &&
skb->protocol == htons(ETH_P_IP)) {
skb->protocol = htons(ETH_P_IPV6);
goto retry;
return -EINVAL;
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