Re: [PATCH V2 net] tuntap: properly align skb->head before building skb

[David Miller]

From: Jason Wang <jasowang@xxxxxxxxxx>
Date: Fri, 27 Oct 2017 11:05:44 +0800

> An unaligned alloc_frag->offset caused by previous allocation will
> result an unaligned skb->head. This will lead unaligned
> skb_shared_info and then unaligned dataref which requires to be
> aligned for accessing on some architecture. Fix this by aligning
> alloc_frag->offset before the frag refilling.
> 
> Fixes: 0bbd7dad34f8 ("tun: make tun_build_skb() thread safe")
> Cc: Eric Dumazet <edumazet@xxxxxxxxxx>
> Cc: Willem de Bruijn <willemdebruijn.kernel@xxxxxxxxx>
> Cc: Wei Wei <dotweiba@xxxxxxxxx>
> Cc: Dmitry Vyukov <dvyukov@xxxxxxxxxx>
> Cc: Mark Rutland <mark.rutland@xxxxxxx>
> Reported-by: Wei Wei <dotweiba@xxxxxxxxx>
> Signed-off-by: Jason Wang <jasowang@xxxxxxxxxx>

Applied and queued up for -stable, thanks Jason.