From f606893fbbc64d68510c5cc3e64e39971e5f26e0 Mon Sep 17 00:00:00 2001 From: Benjamin Beichler Date: Wed, 7 Mar 2018 18:11:07 +0100 Subject: [PATCH] mac80211_hwsim: fix use-after-free bug in hwsim_exit_net commit 8cfd36a0b53aeb4ec21d81eb79706697b84dfc3d upstream. When destroying a net namespace, all hwsim interfaces, which are not created in default namespace are deleted. But the async deletion of the interfaces could last longer than the actual destruction of the namespace, which results to an use after free bug. Therefore use synchronous deletion in this case. Fixes: 100cb9ff40e0 ("mac80211_hwsim: Allow managing radios from non-initial namespaces") Reported-by: syzbot+70ce058e01259de7bb1d@syzkaller.appspotmail.com Signed-off-by: Benjamin Beichler Signed-off-by: Johannes Berg Signed-off-by: Greg Kroah-Hartman --- drivers/net/wireless/mac80211_hwsim.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index 977fd7aa2082..d686ba10fecc 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -3427,8 +3427,11 @@ static void __net_exit hwsim_exit_net(struct net *net) continue; list_del(&data->list); - INIT_WORK(&data->destroy_work, destroy_radio); - schedule_work(&data->destroy_work); + spin_unlock_bh(&hwsim_radio_lock); + mac80211_hwsim_del_radio(data, wiphy_name(data->hw->wiphy), + NULL); + spin_lock_bh(&hwsim_radio_lock); + } spin_unlock_bh(&hwsim_radio_lock); } -- 2.20.1