[PATCH v2] bonding: fix race condition in bonding_store_slaves_active

[Nikolay Aleksandrov <nikolay@redhat.com>]

 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>
---
 drivers/net/bonding/bond_sysfs.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index ef8d2a0..ba4f95b 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -1582,6 +1582,7 @@ 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)
@@ -1590,6 +1591,7 @@ static ssize_t bonding_store_slaves_active(struct device *d,
 				slave->inactive = 1;
 		}
 	}
+	read_unlock(&bond->lock);
 out:
 	return ret;
 }
-- 
1.7.11.7