netdev - Re: [PATCH V2 resend] ipv6: fix incorrect route 'expires' value passed to userspace

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Date:	Mon, 23 Jul 2012 09:05:05 +0800
From:	Li Wei <lw@...fujitsu.com>
To:	David Miller <davem@...emloft.net>
CC:	David.Laight@...LAB.COM, netdev@...r.kernel.org,
	shemminger@...tta.com
Subject: Re: [PATCH V2 resend] ipv6: fix incorrect route 'expires' value passed
 to userspace

On 07/21/2012 02:22 AM, David Miller wrote:
> From: "David Laight" <David.Laight@...LAB.COM>
> Date: Fri, 20 Jul 2012 11:32:05 +0100
> 
>>> -	else if (rt->dst.expires - jiffies < INT_MAX)
>>> -		expires = rt->dst.expires - jiffies;
>>> +	else if ((long)rt->dst.expires - (long)jiffies > INT_MIN
>>> +			&& (long)rt->dst.expires - (long)jiffies <
>> INT_MAX)
>>> +		expires = (long)rt->dst.expires - (long)jiffies;
>>>  	else
>>> -		expires = INT_MAX;
>>> +		expires = time_is_after_jiffies(rt->dst.expires) ?
>> INT_MAX : INT_MIN;
>>
>> I can't help feeling there is a better way to do this.
>> Maybe:
>> 	long expires = rt->dst.expires - jiffies;
>> 	if (expires != (int)expires)
>> 		expires = expires > 0 ? INT_MAX : INT_MIN;
>> Although maybe -INT_MAX instead of INT_MIN.
> 
> This patch also does not apply at all to net-next, so needs to be
> redone regardless.

I'll redone this patch base on 'net-next'.

Thanks

> 
> 
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