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author[email protected] <[email protected]>2012-11-29 01:37:59 +0000
committerDavid S. Miller <[email protected]>2012-11-29 13:13:15 -0500
commite196c0e579902f42cf72414461fb034e5a1ffbf7 (patch)
treefb17f8a56d9e8f51c26cfd6b4abf0212aa617aee
parent90fb6250c509cabd425b7ae4524053dba2e27e2c (diff)
bonding: fix race condition in bonding_store_slaves_active
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 <[email protected]> Signed-off-by: Jay Vosburgh <[email protected]> Signed-off-by: David S. Miller <[email protected]>
-rw-r--r--drivers/net/bonding/bond_sysfs.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c
index 3327a072e224..1877ed7ca086 100644
--- a/drivers/net/bonding/bond_sysfs.c
+++ b/drivers/net/bonding/bond_sysfs.c
@@ -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;
}