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authorVeaceslav Falico <vfalico@redhat.com>2014-01-10 11:59:43 +0100
committerDavid S. Miller <davem@davemloft.net>2014-01-13 22:22:27 -0800
commitc1bc9644ecd1f663f918d42b33b41a508683b0ee (patch)
treed020bd6c841fbd0f368618a3e88db5417d46e3bf /drivers/net/bonding/bond_3ad.c
parent853dc21bfe15f545347b5c82aad02735d552110d (diff)
downloadlinux-linaro-stable-c1bc9644ecd1f663f918d42b33b41a508683b0ee.tar.gz
bonding: fix bond_3ad_set_carrier() RCU usage
Currently, its usage is just plainly wrong. It first gets a slave under RCU, and, after releasing the RCU lock, continues to use it - whilst it can be freed. Fix this by ensuring that bond_3ad_set_carrier() holds RCU till it uses its slave (or its agg). Fixes: be79bd048ab ("bonding: add RCU for bond_3ad_state_machine_handler()") CC: dingtianhong@huawei.com CC: Jay Vosburgh <fubar@us.ibm.com> CC: Andy Gospodarek <andy@greyhouse.net> Signed-off-by: Veaceslav Falico <vfalico@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/bonding/bond_3ad.c')
-rw-r--r--drivers/net/bonding/bond_3ad.c22
1 files changed, 11 insertions, 11 deletions
diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c
index 29db1caee764..da0d7c54d352 100644
--- a/drivers/net/bonding/bond_3ad.c
+++ b/drivers/net/bonding/bond_3ad.c
@@ -2327,32 +2327,32 @@ int bond_3ad_set_carrier(struct bonding *bond)
{
struct aggregator *active;
struct slave *first_slave;
+ int ret = 1;
rcu_read_lock();
first_slave = bond_first_slave_rcu(bond);
- rcu_read_unlock();
- if (!first_slave)
- return 0;
+ if (!first_slave) {
+ ret = 0;
+ goto out;
+ }
active = __get_active_agg(&(SLAVE_AD_INFO(first_slave).aggregator));
if (active) {
/* are enough slaves available to consider link up? */
if (active->num_of_ports < bond->params.min_links) {
if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
- return 1;
+ goto out;
}
} else if (!netif_carrier_ok(bond->dev)) {
netif_carrier_on(bond->dev);
- return 1;
+ goto out;
}
- return 0;
- }
-
- if (netif_carrier_ok(bond->dev)) {
+ } else if (netif_carrier_ok(bond->dev)) {
netif_carrier_off(bond->dev);
- return 1;
}
- return 0;
+out:
+ rcu_read_unlock();
+ return ret;
}
/**