netdev - Re: [PATCH net] xen-netback: make sure skb linear area covers checksum field

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Date:	Wed, 11 Dec 2013 16:47:16 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	paul.durrant@...rix.com
Cc:	xen-devel@...ts.xen.org, netdev@...r.kernel.org,
	wei.liu2@...rix.com, ian.campbell@...rix.com,
	david.vrabel@...rix.com
Subject: Re: [PATCH net] xen-netback: make sure skb linear area covers
 checksum field

From: Paul Durrant <paul.durrant@...rix.com>
Date: Wed, 11 Dec 2013 16:37:40 +0000

> skb_partial_csum_set requires that the linear area of the skb covers the
> checksum field. The checksum setup code in netback was only doing that
> pullup in the case when the pseudo header checksum was being recalculated
> though. This patch makes that pullup unconditional. (I pullup the whole
> transport header just for simplicity; the requirement is only for the check
> field but in the case of UDP this is the last field in the header and in the
> case of TCP it's the last but one).
> 
> The lack of pullup manifested as failures running Microsoft HCK network
> tests on a pair of Windows 8 VMs and it has been verified that this patch
> fixes the problem.
> 
> Signed-off-by: Paul Durrant <paul.durrant@...rix.com>

Applied, thank you.
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