linux-kernel - Re: [PATCH] net: mv643xx_eth: fix packet corruption with TSO and tiny unaligned packets.

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Date:	Thu, 28 Jan 2016 22:12:08 +0100
From:	Philipp Kirchhofer <philipp@...ilie-kirchhofer.de>
To:	Nicolas Schichan <nschichan@...ebox.fr>,
	Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:	Philipp Kirchhofer <philipp@...ilie-kirchhofer.de>
Subject: Re: [PATCH] net: mv643xx_eth: fix packet corruption with TSO and tiny
 unaligned packets.

Am 26.01.2016 um 16:12 schrieb Nicolas Schichan:
> The code in txq_put_data() would use txq->tx_curr_desc to index the
> tso_hdrs/tso_hdrs_dma buffers, for less than 8 bytes unaligned
> fragments, which is already moved to the next descriptor at the
> beginning of the function.
>
> If that fragment was the last of the the skb, the next skb would use
> that same space to place the ip headers, overwritting that small
> fragment data.
>
> Fixes: 91986fd3d335 (net: mv643xx_eth: Ensure proper data alignment in TSO TX path)
> Signed-off-by: Nicolas Schichan <nschichan@...ebox.fr>

Hello Nicolas,

thanks for catching this bug. Fix is good.

Reviewed-by: Philipp Kirchhofer <philipp@...ilie-kirchhofer.de>

Best wishes,
   Philipp