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authorEric Dumazet <dada1@cosmosbay.com>2009-04-23 03:39:04 +0000
committerDavid S. Miller <davem@davemloft.net>2009-05-01 15:18:19 -0700
commit689c96cca7ec3d2ba7fba00481810f99f1803c63 (patch)
tree0aede65eabbcbcb8bb0eaebca225a56772e5a8eb /drivers/net
parent00b64f2aa5e8741b49e48ebad1116cc78dbbf0fd (diff)
downloadlinux-689c96cca7ec3d2ba7fba00481810f99f1803c63.tar.bz2
bonding: bond_slave_info_query() fix
bond_slave_info_query() should keep a read lock while accessing slave info, or risk accessing stale data and corruption. Signed-off-by: Eric Dumazet <dada1@cosmosbay.com> Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net')
-rw-r--r--drivers/net/bonding/bond_main.c23
1 files changed, 7 insertions, 16 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index 63369b6b14d4..67515b78ff91 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -2213,33 +2213,24 @@ static int bond_slave_info_query(struct net_device *bond_dev, struct ifslave *in
{
struct bonding *bond = netdev_priv(bond_dev);
struct slave *slave;
- int i, found = 0;
-
- if (info->slave_id < 0) {
- return -ENODEV;
- }
+ int i, res = -ENODEV;
read_lock(&bond->lock);
bond_for_each_slave(bond, slave, i) {
if (i == (int)info->slave_id) {
- found = 1;
+ res = 0;
+ strcpy(info->slave_name, slave->dev->name);
+ info->link = slave->link;
+ info->state = slave->state;
+ info->link_failure_count = slave->link_failure_count;
break;
}
}
read_unlock(&bond->lock);
- if (found) {
- strcpy(info->slave_name, slave->dev->name);
- info->link = slave->link;
- info->state = slave->state;
- info->link_failure_count = slave->link_failure_count;
- } else {
- return -ENODEV;
- }
-
- return 0;
+ return res;
}
/*-------------------------------- Monitoring -------------------------------*/