Patch "ipv6: Check expire on DST_NOCACHE route" has been added to the 4.3-stable tree

This is a note to let you know that I've just added the patch titled

ipv6: Check expire on DST_NOCACHE route

to the 4.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
ipv6-check-expire-on-dst_nocache-route.patch
and it can be found in the queue-4.3 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Martin KaFai Lau <[email protected]>
Date: Wed, 11 Nov 2015 11:51:07 -0800
Subject: ipv6: Check expire on DST_NOCACHE route

From: Martin KaFai Lau <[email protected]>

[ Upstream commit 5973fb1e245086071bf71994c8b54d99526ded03 ]

Since the expires of the DST_NOCACHE rt can be set during the ip6_rt_update_pmtu(), we also need to consider the expires value when doing ip6_dst_check().

This patches creates __rt6_check_expired() to only check the expire value (if one exists) of the current rt.

In rt6_dst_from_check(), it adds __rt6_check_expired() as one of the condition check.

---
 net/ipv6/route.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

@@ -403,6 +403,14 @@ static void ip6_dst_ifdown(struct dst_en
 	}
 }
 
+static bool __rt6_check_expired(const struct rt6_info *rt)
+{
+	if (rt->rt6i_flags & RTF_EXPIRES)
+		return time_after(jiffies, rt->dst.expires);
+	else
+		return false;
+}
+
 static bool rt6_check_expired(const struct rt6_info *rt)
 {
 	if (rt->rt6i_flags & RTF_EXPIRES) {

@@ -1270,7 +1278,8 @@ static struct dst_entry *rt6_check(struc
 
 static struct dst_entry *rt6_dst_from_check(struct rt6_info *rt, u32 cookie)
 {
-	if (rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
+	if (!__rt6_check_expired(rt) &&
+	    rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK &&
 	    rt6_check((struct rt6_info *)(rt->dst.from), cookie))
 		return &rt->dst;
 	else

Patches currently in stable-queue which might be from [email protected] are

queue-4.3/ipv6-check-rt-dst.from-for-the-dst_nocache-route.patch queue-4.3/ipv6-avoid-creating-rtf_cache-from-a-rt-that-is-not-managed-by-fib6-tree.patch queue-4.3/ipv6-check-expire-on-dst_nocache-route.patch queue-4.3/net-ip6_tunnel-fix-dst-leak.patch