bonding: fix race condition in bonding_store_slaves_active
authornikolay@redhat.com <nikolay@redhat.com>
Thu, 29 Nov 2012 01:37:59 +0000 (01:37 +0000)
committerDavid S. Miller <davem@davemloft.net>
Thu, 29 Nov 2012 18:13:15 +0000 (13:13 -0500)
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>
drivers/net/bonding/bond_sysfs.c

index 3327a072e224d8d4664d7abb7b93c11de30051a9..1877ed7ca0864ed4adfb614de862ed40dde730bd 100644 (file)
@@ -1568,6 +1568,7 @@ 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)
@@ -1576,6 +1577,7 @@ static ssize_t bonding_store_slaves_active(struct device *d,
                                slave->inactive = 1;
                }
        }
+       read_unlock(&bond->lock);
 out:
        return ret;
 }