diff options
| author | nikolay@redhat.com <nikolay@redhat.com> | 2012-11-29 01:37:59 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-12-17 09:27:19 -0800 |
| commit | c60fcb1a18086c3050ff05c49f16ce4bf6d11421 (patch) | |
| tree | 319db6943dd4cf186105f1ca0d2ecc64a774a623 | |
| parent | 6ba4bcac7bec6cb59ab193156695a5c868e89cd2 (diff) | |
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>
| -rw-r--r-- | drivers/net/bonding/bond_sysfs.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/bonding/bond_sysfs.c b/drivers/net/bonding/bond_sysfs.c index dc15d248443..21609f944b3 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; } |