netdev - Re: [PATCH net v2] net: test tailroom before appending to linear skb

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Message-Id: <20180517.170736.1069647347006753023.davem@davemloft.net>
Date:   Thu, 17 May 2018 17:07:36 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     willemdebruijn.kernel@...il.com
Cc:     netdev@...r.kernel.org, willemb@...gle.com
Subject: Re: [PATCH net v2] net: test tailroom before appending to linear
 skb

From: Willem de Bruijn <willemdebruijn.kernel@...il.com>
Date: Thu, 17 May 2018 13:13:29 -0400

> 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>
> 
> ---
> 
> v2: fix ipv4 boundary condition

Applied and queued up for -stable, thanks Willem.