linux-kernel - Re: [PATCH 9/9] tulip_core.c : out-of-bounds check.

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Date:	Fri, 13 Mar 2015 21:41:21 +0300
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	Ameen Ali <ameenali023@...il.com>, grundler@...isc-linux.org
CC:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 9/9] tulip_core.c : out-of-bounds check.

Hello.

On 03/13/2015 05:15 PM, Ameen Ali wrote:

> Array index 'j' is used before limits check.

> Suggest put limit check before index use.

> Signed-off-by : <Ameenali023@...il.com>
> ---
>   drivers/net/ethernet/dec/tulip/tulip_core.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

> diff --git a/drivers/net/ethernet/dec/tulip/tulip_core.c b/drivers/net/ethernet/dec/tulip/tulip_core.c
> index 3b42556..ed41559 100644
> --- a/drivers/net/ethernet/dec/tulip/tulip_core.c
> +++ b/drivers/net/ethernet/dec/tulip/tulip_core.c
> @@ -589,7 +589,7 @@ static void tulip_tx_timeout(struct net_device *dev)
>   			       (unsigned int)tp->rx_ring[i].buffer1,
>   			       (unsigned int)tp->rx_ring[i].buffer2,
>   			       buf[0], buf[1], buf[2]);
> -			for (j = 0; buf[j] != 0xee && j < 1600; j++)
> +			for (j = 0; ((j < 1600) && buf[j] != 0xee); j++)

    No need for extra parens, either around < or around &&.

WBR, Sergei

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