From: Cong Wang xiyou.wangcong@gmail.com
[ Upstream commit 832707021666411d04795c564a4adea5d6b94f17 ]
When we tear down a network namespace, we unregister all the netdevices within it. So we may queue a slave device and a bonding device together in the same unregister queue.
If the only slave device is non-ethernet, it would automatically unregister the bonding device as well. Thus, we may end up unregistering the bonding device twice.
Workaround this special case by checking reg_state.
Fixes: 9b5e383c11b0 ("net: Introduce unregister_netdevice_many()") Reported-by: syzbot+af23e7f3e0a7e10c8b67@syzkaller.appspotmail.com Cc: Eric Dumazet eric.dumazet@gmail.com Cc: Andy Gospodarek andy@greyhouse.net Cc: Jay Vosburgh j.vosburgh@gmail.com Signed-off-by: Cong Wang xiyou.wangcong@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/bonding/bond_main.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c index 11c014586d466..ce829a7a92101 100644 --- a/drivers/net/bonding/bond_main.c +++ b/drivers/net/bonding/bond_main.c @@ -2037,7 +2037,8 @@ static int bond_release_and_destroy(struct net_device *bond_dev, int ret;
ret = __bond_release_one(bond_dev, slave_dev, false, true); - if (ret == 0 && !bond_has_slaves(bond)) { + if (ret == 0 && !bond_has_slaves(bond) && + bond_dev->reg_state != NETREG_UNREGISTERING) { bond_dev->priv_flags |= IFF_DISABLE_NETPOLL; netdev_info(bond_dev, "Destroying bond\n"); bond_remove_proc_entry(bond);