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

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Message-Id: <20120720.112241.2111041227435292899.davem@davemloft.net>
Date:	Fri, 20 Jul 2012 11:22:41 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	David.Laight@...LAB.COM
Cc:	lw@...fujitsu.com, netdev@...r.kernel.org, shemminger@...tta.com
Subject: Re: [PATCH V2 resend] ipv6: fix incorrect route 'expires' value
 passed to userspace

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.

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