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Date:   Sat, 28 Oct 2017 19:06:15 +0900 (KST)
From:   David Miller <>
Subject: Re: [PATCH V2 net] tuntap: properly align skb->head before
 building skb

From: Jason Wang <>
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 <>
> Cc: Willem de Bruijn <>
> Cc: Wei Wei <>
> Cc: Dmitry Vyukov <>
> Cc: Mark Rutland <>
> Reported-by: Wei Wei <>
> Signed-off-by: Jason Wang <>

Applied and queued up for -stable, thanks Jason.

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