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net: ipv4: fix one memleak in __inet_del_ifa()

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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: 0ff60a4567 ("[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>
This commit is contained in:
Liu Jian 2023-09-07 10:57:09 +08:00 committed by David S. Miller
parent 73be7fb14e
commit ac28b1ec61
1 changed files with 5 additions and 5 deletions
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10
net/ipv4/devinet.c
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@ -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;