linux-kernel - Re: [patch] r8169: fix crash when large packets are received

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Message-Id: <20090609.040114.256650768.davem@davemloft.net>
Date:	Tue, 09 Jun 2009 04:01:14 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, mjt@....msk.ru,
	linux-kernel@...r.kernel.org, romieu@...zoreil.com
Subject: Re: [patch] r8169: fix crash when large packets are received

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Tue, 09 Jun 2009 00:07:07 +0200

> Michael Tokarev reported receiving a large packet could crash
> a machine with RTL8169 NIC.
> ( original thread at http://lkml.org/lkml/2009/6/8/192 )
> 
> Problem is this driver tells that NIC frames up to 16383 bytes
> can be received but provides skb to rx ring allocated with
> smaller sizes (1536 bytes in case standard 1500 bytes MTU is used)
> 
> When a frame larger than what was allocated by driver is received,
> dma transfert can occurs past the end of buffer and corrupt
> kernel memory.
> 
> Fix is to tell to NIC what is the maximum size a frame can be.
> 
> This bug is very old, (before git introduction, linux-2.6.10), and 
> should be backported to stable versions.
> 
> Reported-by: Michael Tokarev <mjt@....msk.ru>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>
> Tested-by: Michael Tokarev <mjt@....msk.ru>

Applied to net-2.6, thanks Eric.
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