From: Eric Dumazet Date: Thu, 18 Nov 2010 17:30:42 +0000 (-0800) Subject: bonding: fix a race in IGMP handling X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3006bc38895895f1a0352c2e17e1a503f35f7e2f;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git 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 Signed-off-by: David S. Miller --- diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index bdb68a600382..71a169740d05 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();