linux-kernel - Re: KASAN failures in X-Gene ethernet driver in v4.4-rc2

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Message-ID: <20151125163402.GA29094@leverpostej>
Date:	Wed, 25 Nov 2015 16:34:02 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, isubramanian@....com, kchudgar@....com,
	linux-kernel@...r.kernel.org, ryabinin.a.a@...il.com,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: KASAN failures in X-Gene ethernet driver in v4.4-rc2

On Wed, Nov 25, 2015 at 08:17:36AM -0800, Eric Dumazet wrote:
> On Wed, 2015-11-25 at 15:59 +0000, Mark Rutland wrote:
> > xgene_enet_start_xmit
> 
> Please try following trivial fix

With that applied KASAN is silent, despite my efforts to trigger the
issue, so it looks like that fixes it.

Thanks,
Mark.

> diff --git a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> index 1adfe7036843..9147a0107c44 100644
> --- a/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> +++ b/drivers/net/ethernet/apm/xgene/xgene_enet_main.c
> @@ -450,12 +450,12 @@ static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
>  		return NETDEV_TX_OK;
>  	}
>  
> -	pdata->ring_ops->wr_cmd(tx_ring, count);
>  	skb_tx_timestamp(skb);
>  
>  	pdata->stats.tx_packets++;
>  	pdata->stats.tx_bytes += skb->len;
>  
> +	pdata->ring_ops->wr_cmd(tx_ring, count);
>  	return NETDEV_TX_OK;
>  }
>  
> 
> 
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