tree b63b3543554c2522aefeee48c48c0002e2824bb9
parent 2d1264b5e665909a3217a16c362802c14ee807c0
author Benjamin Beichler <benjamin.beichler@uni-rostock.de> 1520442667 +0100
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1524994317 +0200

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 <benjamin.beichler@uni-rostock.de>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>