linux-kernel - Re: [Xen-devel] [PATCH] drivers: net: xen-netfront: fix array initialization bug

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Message-Id: <20140414.125131.1934050779129550948.davem@davemloft.net>
Date:	Mon, 14 Apr 2014 12:51:31 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	david.vrabel@...rix.com
Cc:	v.maffione@...il.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, xen-devel@...ts.xenproject.org,
	boris.ostrovsky@...cle.com
Subject: Re: [Xen-devel] [PATCH] drivers: net: xen-netfront: fix array
 initialization bug

From: David Vrabel <david.vrabel@...rix.com>
Date: Mon, 14 Apr 2014 10:42:20 +0100

> On 12/04/14 21:51, David Miller wrote:
>> From: Vincenzo Maffione <v.maffione@...il.com>
>> Date: Sat, 12 Apr 2014 11:55:40 +0200
>> 
>>> This patch fixes the initialization of an array used in the TX
>>> datapath that was mistakenly initialized together with the
>>> RX datapath arrays. An out of range array access could happen
>>> when RX and TX rings had different sizes.
>>>
>>> Signed-off-by: Vincenzo Maffione <v.maffione@...il.com>
>> 
>> Good catch, applied, thanks.
> 
> Thanks.  You can queue this for net-next since the Tx and Rx rings are
> the same constant size.

I was able to determine when I reviewed this patch that the size in bytes
of the rings are the same (PAGE_SIZE), but I couldn't ascertain whether
the individual ring entries in the TX ring and RX ring are the same size.

Are they?
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