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mac80211_hwsim: fix use-after-free bug in hwsim_exit_net

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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 <benjamin.beichler@uni-rostock.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Benjamin Beichler 2018-03-07 18:11:07 +01:00 committed by Johannes Berg
parent 796e111217
commit 8cfd36a0b5
1 changed files with 6 additions and 2 deletions
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8
drivers/net/wireless/mac80211_hwsim.c
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@ -3528,8 +3528,12 @@ static void __net_exit hwsim_exit_net(struct net *net)
list_del(&data->list);
rhashtable_remove_fast(&hwsim_radios_rht, &data->rht,
hwsim_rht_params);
INIT_WORK(&data->destroy_work, destroy_radio);
queue_work(hwsim_wq, &data->destroy_work);
hwsim_radios_generation++;
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);