net: ipv4: fix one memleak in __inet_del_ifa()

I got the below warning when do fuzzing test:
unregister_netdevice: waiting for bond0 to become free. Usage count = 2

It can be repoduced via:

ip link add bond0 type bond
sysctl -w net.ipv4.conf.bond0.promote_secondaries=1
ip addr add 4.117.174.103/0 scope 0x40 dev bond0
ip addr add 192.168.100.111/255.255.255.254 scope 0 dev bond0
ip addr add 0.0.0.4/0 scope 0x40 secondary dev bond0
ip addr del 4.117.174.103/0 scope 0x40 dev bond0
ip link delete bond0 type bond

In this reproduction test case, an incorrect 'last_prim' is found in
__inet_del_ifa(), as a result, the secondary address(0.0.0.4/0 scope 0x40)
is lost. The memory of the secondary address is leaked and the reference of
in_device and net_device is leaked.

Fix this problem:
Look for 'last_prim' starting at location of the deleted IP and inserting
the promoted IP into the location of 'last_prim'.

Fixes: 0ff60a45678e ("[IPV4]: Fix secondary IP addresses after promotion")
Signed-off-by: Liu Jian <liujian56@huawei.com>
Signed-off-by: Julian Anastasov <ja@ssi.bg>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv4/devinet.c b/net/ipv4/devinet.c
index 9cf64ee47dd2b4fddf7be62c7110a1ad41b53fe8..ca0ff15dc8fa358b81a804eda7398ecd10f00743 100644 (file)
--- a/net/ipv4/devinet.c
+++ b/net/ipv4/devinet.c
@@ -355,14 +355,14 @@ static void __inet_del_ifa(struct in_device *in_dev,
 {
        struct in_ifaddr *promote = NULL;
        struct in_ifaddr *ifa, *ifa1;
-       struct in_ifaddr *last_prim;
+       struct in_ifaddr __rcu **last_prim;
        struct in_ifaddr *prev_prom = NULL;
        int do_promote = IN_DEV_PROMOTE_SECONDARIES(in_dev);
 
        ASSERT_RTNL();
 
        ifa1 = rtnl_dereference(*ifap);
-       last_prim = rtnl_dereference(in_dev->ifa_list);
+       last_prim = ifap;
        if (in_dev->dead)
                goto no_promotions;
 
@@ -376,7 +376,7 @@ static void __inet_del_ifa(struct in_device *in_dev,
                while ((ifa = rtnl_dereference(*ifap1)) != NULL) {
                        if (!(ifa->ifa_flags & IFA_F_SECONDARY) &&
                            ifa1->ifa_scope <= ifa->ifa_scope)
-                               last_prim = ifa;
+                               last_prim = &ifa->ifa_next;
 
                        if (!(ifa->ifa_flags & IFA_F_SECONDARY) ||
                            ifa1->ifa_mask != ifa->ifa_mask ||
@@ -440,9 +440,9 @@ no_promotions:
 
                        rcu_assign_pointer(prev_prom->ifa_next, next_sec);
 
-                       last_sec = rtnl_dereference(last_prim->ifa_next);
+                       last_sec = rtnl_dereference(*last_prim);
                        rcu_assign_pointer(promote->ifa_next, last_sec);
-                       rcu_assign_pointer(last_prim->ifa_next, promote);
+                       rcu_assign_pointer(*last_prim, promote);
                }
 
                promote->ifa_flags &= ~IFA_F_SECONDARY;