bonding: fix race condition in bonding_store_slaves_active

[ Upstream commit e196c0e579902f42cf72414461fb034e5a1ffbf7 ]

Race between bonding_store_slaves_active() and slave manipulation
 functions. The bond_for_each_slave use in bonding_store_slaves_active()
 is not protected by any synchronization mechanism.
 NULL pointer dereference is easy to reach.
 Fixed by acquiring the bond->lock for the slave walk.

 v2: Make description text < 75 columns

Signed-off-by: Nikolay Aleksandrov <nikolay@redhat.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 06246109538f0e52a23e53b2d1799d2980b0ea64..8a967358a80694c5b5bc5cd6161bf9b0b1d2461e 100644 (file)
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -1524,6 +1524,7 @@ static ssize_t bonding_store_slaves_active(struct device *d,
                goto out;
        }
 
+       read_lock(&bond->lock);
        bond_for_each_slave(bond, slave, i) {
                if (!bond_is_active_slave(slave)) {
                        if (new_value)
@@ -1532,6 +1533,7 @@ static ssize_t bonding_store_slaves_active(struct device *d,
                                slave->inactive = 1;
                }
        }
+       read_unlock(&bond->lock);
 out:
        return ret;
 }