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udp: fix the proto value passed to ip_protocol_deliver_rcu for the segments

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Guillaume noticed that: for segments udp_queue_rcv_one_skb() returns the
proto, and it should pass "ret" unmodified to ip_protocol_deliver_rcu().
Otherwize, with a negtive value passed, it will underflow inet_protos.

This can be reproduced with IPIP FOU:

  # ip fou add port 5555 ipproto 4
  # ethtool -K eth1 rx-gro-list on

Fixes: cf329aa42b66 ("udp: cope with UDP GRO packet misdirection")
Reported-by: Guillaume Nault <gnault@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long 2020-12-07 15:55:40 +08:00 committed by David S. Miller
parent 61f54de2e9
commit 10c678bd0a
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/udp.c
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@ -2173,7 +2173,7 @@ static int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb)
__skb_pull(skb, skb_transport_offset(skb));
ret = udp_queue_rcv_one_skb(sk, skb);
if (ret > 0)
ip_protocol_deliver_rcu(dev_net(skb->dev), skb, -ret);
ip_protocol_deliver_rcu(dev_net(skb->dev), skb, ret);
}
return 0;
}