From: Li Wei <lw@cn.fujitsu.com>
Date: Sun, 29 Jul 2012 16:01:30 +0000 (+0000)
Subject: ipv6: fix incorrect route 'expires' value passed to userspace
X-Git-Tag: v3.6-rc1~30^2~15
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8253947e2cdfb14717c9212b751b7aec9ea9ef5e;p=pandora-kernel.git

ipv6: fix incorrect route 'expires' value passed to userspace

When userspace use RTM_GETROUTE to dump route table, with an already
expired route entry, we always got an 'expires' value(2147157)
calculated base on INT_MAX.

The reason of this problem is in the following satement:
	rt->dst.expires - jiffies < INT_MAX
gcc promoted the type of both sides of '<' to unsigned long, thus
a small negative value would be considered greater than INT_MAX.

With the help of Eric Dumazet, do the out of bound checks in
rtnl_put_cacheinfo(), _after_ conversion to clock_t.

Signed-off-by: Li Wei <lw@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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