From: Denis V. Lunev <den@openvz.org>
Date: Thu, 3 Apr 2008 20:30:17 +0000 (-0700)
Subject: [IPV6]: Event type in addrconf_ifdown is mis-used.
X-Git-Tag: v2.6.25-rc9~53^2~6
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=439e23857a21c3a953826eed23c818697a97de1a;p=linux-2.6

[IPV6]: Event type in addrconf_ifdown is mis-used.

addrconf_ifdown is broken in respect to the usage of how
parameter. This function is called with (event != NETDEV_DOWN) and (2)
on the IPv6 stop.  It the latter case inet6_dev from loopback device
should be destroyed.

Signed-off-by: Denis V. Lunev <den@openvz.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index e7a1882db0..4fa9da0be1 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -2469,7 +2469,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 	/* Step 1: remove reference to ipv6 device from parent device.
 		   Do not dev_put!
 	 */
-	if (how == 1) {
+	if (how) {
 		idev->dead = 1;
 
 		/* protected by rtnl_lock */
@@ -2501,12 +2501,12 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 	write_lock_bh(&idev->lock);
 
 	/* Step 3: clear flags for stateless addrconf */
-	if (how != 1)
+	if (!how)
 		idev->if_flags &= ~(IF_RS_SENT|IF_RA_RCVD|IF_READY);
 
 	/* Step 4: clear address list */
 #ifdef CONFIG_IPV6_PRIVACY
-	if (how == 1 && del_timer(&idev->regen_timer))
+	if (how && del_timer(&idev->regen_timer))
 		in6_dev_put(idev);
 
 	/* clear tempaddr list */
@@ -2543,7 +2543,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 
 	/* Step 5: Discard multicast list */
 
-	if (how == 1)
+	if (how)
 		ipv6_mc_destroy_dev(idev);
 	else
 		ipv6_mc_down(idev);
@@ -2552,7 +2552,7 @@ static int addrconf_ifdown(struct net_device *dev, int how)
 
 	/* Shot the device (if unregistered) */
 
-	if (how == 1) {
+	if (how) {
 		addrconf_sysctl_unregister(idev);
 		neigh_parms_release(&nd_tbl, idev->nd_parms);
 		neigh_ifdown(&nd_tbl, dev);