ipv6: prevent race between address creation and removal

There's a race in IPv6 automatic addess assignment. The address is created
with zero lifetime when it's added to various address lists. Before it gets
assigned the correct lifetime, there's a window where a new address may be
configured. This causes the semi-initiated address to be deleted in
addrconf_verify.

This was discovered as a reference leak caused by concurrent run of
__ipv6_ifa_notify for both RTM_NEWADDR and RTM_DELADDR with the same
address.

Fix this by setting the lifetime before the address is added to
inet6_addr_lst.

A few notes:

1. In addrconf_prefix_rcv, by setting update_lft to zero, the
   if (update_lft) { ... } condition is no longer executed for newly
   created addresses. This is okay, as the ifp fields are set in
   ipv6_add_addr now and ipv6_ifa_notify is called (and has been called)
   through addrconf_dad_start.

2. The removal of the whole block under ifp->lock in inet6_addr_add is okay,
   too, as tstamp is initialized to jiffies in ipv6_add_addr.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 16 deletions

diff --git a/net/ipv6/addrconf.c b/net/ipv6/addrconf.c
index a0ce957fb671..da4241c8c7da 100644
--- a/net/ipv6/addrconf.c
+++ b/net/ipv6/addrconf.c
@@ -815,7 +815,7 @@ static u32 inet6_addr_hash(const struct in6_addr *addr)
 static struct inet6_ifaddr *
 ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
               const struct in6_addr *peer_addr, int pfxlen,
-              int scope, u32 flags)
+              int scope, u32 flags, u32 valid_lft, u32 prefered_lft)
 {
         struct inet6_ifaddr *ifa = NULL;
         struct rt6_info *rt;
@@ -875,6 +875,8 @@ ipv6_add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
         ifa->scope = scope;
         ifa->prefix_len = pfxlen;
         ifa->flags = flags | IFA_F_TENTATIVE;
+        ifa->valid_lft = valid_lft;
+        ifa->prefered_lft = prefered_lft;
         ifa->cstamp = ifa->tstamp = jiffies;
         ifa->tokenized = false;
 
@@ -1127,7 +1129,8 @@ retry:
         ift = !max_addresses ||
               ipv6_count_addresses(idev) < max_addresses ?
                 ipv6_add_addr(idev, &addr, NULL, tmp_plen,
-                              ipv6_addr_scope(&addr), addr_flags) : NULL;
+                              ipv6_addr_scope(&addr), addr_flags,
+                              tmp_valid_lft, tmp_prefered_lft) : NULL;
         if (IS_ERR_OR_NULL(ift)) {
                 in6_ifa_put(ifp);
                 in6_dev_put(idev);
@@ -1139,8 +1142,6 @@ retry:
 
         spin_lock_bh(&ift->lock);
         ift->ifpub = ifp;
-        ift->valid_lft = tmp_valid_lft;
-        ift->prefered_lft = tmp_prefered_lft;
         ift->cstamp = now;
         ift->tstamp = tmp_tstamp;
         spin_unlock_bh(&ift->lock);
@@ -2185,14 +2186,16 @@ ok:
                                 ifp = ipv6_add_addr(in6_dev, &addr, NULL,
                                                     pinfo->prefix_len,
                                                     addr_type&IPV6_ADDR_SCOPE_MASK,
-                                                    addr_flags);
+                                                    addr_flags, valid_lft,
+                                                    prefered_lft);
 
                         if (IS_ERR_OR_NULL(ifp)) {
                                 in6_dev_put(in6_dev);
                                 return;
                         }
 
-                        update_lft = create = 1;
+                        update_lft = 0;
+                        create = 1;
                         ifp->cstamp = jiffies;
                         ifp->tokenized = tokenized;
                         addrconf_dad_start(ifp);
@@ -2213,7 +2216,7 @@ ok:
                                 stored_lft = ifp->valid_lft - (now - ifp->tstamp) / HZ;
                         else
                                 stored_lft = 0;
-                        if (!update_lft && stored_lft) {
+                        if (!update_lft && !create && stored_lft) {
                                 if (valid_lft > MIN_VALID_LIFETIME ||
                                     valid_lft > stored_lft)
                                         update_lft = 1;
@@ -2459,15 +2462,10 @@ static int inet6_addr_add(struct net *net, int ifindex, const struct in6_addr *p
                 prefered_lft = timeout;
         }
 
-        ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags);
+        ifp = ipv6_add_addr(idev, pfx, peer_pfx, plen, scope, ifa_flags,
+                            valid_lft, prefered_lft);
 
         if (!IS_ERR(ifp)) {
-                spin_lock_bh(&ifp->lock);
-                ifp->valid_lft = valid_lft;
-                ifp->prefered_lft = prefered_lft;
-                ifp->tstamp = jiffies;
-                spin_unlock_bh(&ifp->lock);
-
                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, dev,
                                       expires, flags);
                 /*
@@ -2559,7 +2557,8 @@ static void add_addr(struct inet6_dev *idev, const struct in6_addr *addr,
 {
         struct inet6_ifaddr *ifp;
 
-        ifp = ipv6_add_addr(idev, addr, NULL, plen, scope, IFA_F_PERMANENT);
+        ifp = ipv6_add_addr(idev, addr, NULL, plen,
+                            scope, IFA_F_PERMANENT, 0, 0);
         if (!IS_ERR(ifp)) {
                 spin_lock_bh(&ifp->lock);
                 ifp->flags &= ~IFA_F_TENTATIVE;
@@ -2685,7 +2684,7 @@ static void addrconf_add_linklocal(struct inet6_dev *idev, const struct in6_addr
 #endif
 
 
-        ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags);
+        ifp = ipv6_add_addr(idev, addr, NULL, 64, IFA_LINK, addr_flags, 0, 0);
         if (!IS_ERR(ifp)) {
                 addrconf_prefix_route(&ifp->addr, ifp->prefix_len, idev->dev, 0, 0);
                 addrconf_dad_start(ifp);