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mac80211_hwsim: fix use-after-free bug in hwsim_exit_net
commit8cfd36a0b5
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:100cb9ff40
("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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 5 additions and 2 deletions
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@ -3427,8 +3427,11 @@ static void __net_exit hwsim_exit_net(struct net *net)
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continue;
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list_del(&data->list);
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INIT_WORK(&data->destroy_work, destroy_radio);
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schedule_work(&data->destroy_work);
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spin_unlock_bh(&hwsim_radio_lock);
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mac80211_hwsim_del_radio(data, wiphy_name(data->hw->wiphy),
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NULL);
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spin_lock_bh(&hwsim_radio_lock);
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}
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spin_unlock_bh(&hwsim_radio_lock);
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}
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