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| author | nikolay@redhat.com <nikolay@redhat.com> | 2012-11-29 01:37:59 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-11-29 13:13:15 -0500 |
| commit | e196c0e579902f42cf72414461fb034e5a1ffbf7 (patch) | |
| tree | fb17f8a56d9e8f51c26cfd6b4abf0212aa617aee | |
| parent | 90fb6250c509cabd425b7ae4524053dba2e27e2c (diff) | |
| download | linux-stable-e196c0e579902f42cf72414461fb034e5a1ffbf7.tar.gz linux-stable-e196c0e579902f42cf72414461fb034e5a1ffbf7.tar.bz2 linux-stable-e196c0e579902f42cf72414461fb034e5a1ffbf7.zip | |
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 <nikolay@redhat.com>
Signed-off-by: Jay Vosburgh <fubar@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -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 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; } |