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

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Message-ID: <AE90C24D6B3A694183C094C60CF0A2F6026B6F9C@saturn3.aculab.com>
Date:	Fri, 20 Jul 2012 11:32:05 +0100
From:	"David Laight" <David.Laight@...LAB.COM>
To:	"Li Wei" <lw@...fujitsu.com>, "David Miller" <davem@...emloft.net>
Cc:	<netdev@...r.kernel.org>, <shemminger@...tta.com>
Subject: RE: [PATCH V2 resend] ipv6: fix incorrect route 'expires' value passed to userspace

> -	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.

	David



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