netdev - [PATCH net] net/ipv6: Fix updates to prefix route

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 28 Jun 2018 13:36:55 -0700
From:   dsahern@...nel.org
To:     netdev@...r.kernel.org
Cc:     sowmini.varadhan@...cle.com, David Ahern <dsahern@...il.com>
Subject: [PATCH net] net/ipv6: Fix updates to prefix route

From: David Ahern <dsahern@...il.com>

Sowmini reported that a recent commit broke prefix routes for linklocal
addresses. The newly added modify_prefix_route is attempting to add a
new prefix route when the ifp priority does not match the route metric
however the check needs to account for the default priority. In addition,
the route add fails because the route already exists, and then the delete
removes the one that exists. Flip the order to do the delete first.

Fixes: 8308f3ff1753 ("net/ipv6: Add support for specifying metric of connected routes")
Reported-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Tested-by: Sowmini Varadhan <sowmini.varadhan@...cle.com>
Signed-off-by: David Ahern <dsahern@...il.com>
---
 net/ipv6/addrconf.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index c134286d6a41..91580c62bb86 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -4528,6 +4528,7 @@ static int modify_prefix_route(struct inet6_ifaddr *ifp,
 			       unsigned long expires, u32 flags)
 {
 	struct fib6_info *f6i;
+	u32 prio;
 
 	f6i = addrconf_get_prefix_route(&ifp->addr,
 					ifp->prefix_len,
@@ -4536,13 +4537,15 @@ static int modify_prefix_route(struct inet6_ifaddr *ifp,
 	if (!f6i)
 		return -ENOENT;
 
-	if (f6i->fib6_metric != ifp->rt_priority) {
+	prio = ifp->rt_priority ? : IP6_RT_PRIO_ADDRCONF;
+	if (f6i->fib6_metric != prio) {
+		/* delete old one */
+		ip6_del_rt(dev_net(ifp->idev->dev), f6i);
+
 		/* add new one */
 		addrconf_prefix_route(&ifp->addr, ifp->prefix_len,
 				      ifp->rt_priority, ifp->idev->dev,
 				      expires, flags, GFP_KERNEL);
-		/* delete old one */
-		ip6_del_rt(dev_net(ifp->idev->dev), f6i);
 	} else {
 		if (!expires)
 			fib6_clean_expires(f6i);
-- 
2.11.0