netdev - Re: BUG in netxen_release_tx_buffers when TSO enabled on kernels >= 3.3 and <= 3.6

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Date:	Tue, 22 Jan 2013 17:55:04 +0100
From:	Christoph Paasch <christoph.paasch@...ouvain.be>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Ian Campbell <Ian.Campbell@...rix.com>,
	Sony Chacko <sony.chacko@...gic.com>,
	Rajesh Borundia <rajesh.borundia@...gic.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: BUG in netxen_release_tx_buffers when TSO enabled on kernels >= 3.3 and <= 3.6

On Tuesday 22 January 2013 08:33:05 Eric Dumazet wrote:
> [PATCH] netxen: fix off by one bug in netxen_release_tx_buffer()
> 
> Christoph Paasch found netxen could trigger a BUG in its dismantle
> phase, in netxen_release_tx_buffer(), using full size TSO packets.
> 
> cmd_buf->frag_count includes the skb->data part, so the loop must
> start at index 1 instead of 0, or else we can make an out
> of bound access to cmd_buff->frag_array[MAX_SKB_FRAGS + 2]
> 
> Christoph provided the fixes in netxen_map_tx_skb() function.
> In case of a dma mapping error, its better to clear the dma fields
> so that we don't try to unmap them again in netxen_release_tx_buffer()
> 
> Reported-by: Christoph Paasch <christoph.paasch@...ouvain.be>
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Tested-by: Christoph Paasch <christoph.paasch@...ouvain.be>
> Cc: Sony Chacko <sony.chacko@...gic.com>
> Cc: Rajesh Borundia <rajesh.borundia@...gic.com>
> ---
>  drivers/net/ethernet/qlogic/netxen/netxen_nic_init.c |    2 +-
>  drivers/net/ethernet/qlogic/netxen/netxen_nic_main.c |    2 ++
>  2 files changed, 3 insertions(+), 1 deletion(-)

Signed-off-by: Christoph Paasch <christoph.paasch@...ouvain.be>


-- 
IP Networking Lab --- http://inl.info.ucl.ac.be
MultiPath TCP in the Linux Kernel --- http://mptcp.info.ucl.ac.be
UCLouvain
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