From: Herbert Xu
Date: Mon, 13 Jul 2015 16:04:13 +0800
> Shared skbs must not be modified and this is crucial for broadcast
> and/or multicast paths where we use it as an optimisation to avoid
> unnecessary cloning.
>
> The function skb_recv_datagram breaks this rule by setting peeked
> without
Shared skbs must not be modified and this is crucial for broadcast
and/or multicast paths where we use it as an optimisation to avoid
unnecessary cloning.
The function skb_recv_datagram breaks this rule by setting peeked
without cloning the skb first. This causes funky races which leads
to double
