diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2010-11-18 09:30:42 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2010-11-18 09:30:42 -0800 |
| commit | 3006bc38895895f1a0352c2e17e1a503f35f7e2f (patch) | |
| tree | 24a3a9ecbee9215898b4c6b30357740eeeb632bb | |
| parent | 28cb6ccd2c7e86b3a4db94c7062cd27937bed424 (diff) | |
bonding: fix a race in IGMP handling
RCU conversion in IGMP code done in net-next-2.6 raised a race in
__bond_resend_igmp_join_requests().
It iterates in_dev->mc_list without appropriate protection (RTNL, or
read_lock on in_dev->mc_list_lock).
Another cpu might delete an entry while we use it and trigger a fault.
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/bonding/bond_main.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index bdb68a60038..71a169740d0 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -878,8 +878,10 @@ static void __bond_resend_igmp_join_requests(struct net_device *dev) rcu_read_lock(); in_dev = __in_dev_get_rcu(dev); if (in_dev) { + read_lock(&in_dev->mc_list_lock); for (im = in_dev->mc_list; im; im = im->next) ip_mc_rejoin_group(im); + read_unlock(&in_dev->mc_list_lock); } rcu_read_unlock(); |