From: Herbert Xu <[email protected]>
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 cloning the skb first. This causes funky races which leads
> to double-free.
>
> This patch fixes this by cloning the skb and replacing the skb
> in the list when setting skb->peeked.
>
> Fixes: a59322be07c9 ("[UDP]: Only increment counter on first peek/recv")
> Reported-by: Konstantin Khlebnikov <[email protected]>
> Signed-off-by: Herbert Xu <[email protected]>
Applied and queued up for -stable.
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