netdev - Re: [PATCH net] net: test tailroom before appending to linear skb

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Message-ID: <c1c85062-6116-6218-7c52-4460920afba3@gmail.com>
Date:   Thu, 17 May 2018 09:05:29 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Willem de Bruijn <willemdebruijn.kernel@...il.com>,
        netdev@...r.kernel.org
Cc:     davem@...emloft.net, Willem de Bruijn <willemb@...gle.com>
Subject: Re: [PATCH net] net: test tailroom before appending to linear skb



On 05/17/2018 08:54 AM, Willem de Bruijn wrote:
> From: Willem de Bruijn <willemb@...gle.com>
> 
> Device features may change during transmission. In particular with
> corking, a device may toggle scatter-gather in between allocating
> and writing to an skb.
> 
> Do not unconditionally assume that !NETIF_F_SG at write time implies
> that the same held at alloc time and thus the skb has sufficient
> tailroom.
> 
> This issue predates git history.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Reported-by: Eric Dumazet <edumazet@...gle.com>
> Signed-off-by: Willem de Bruijn <willemb@...gle.com>

Excellent, thanks Willem.

Reviewed-by: Eric Dumazet <edumazet@...gle.com>