4.9-stable review patch. If anyone has any objections, please let me know.
------------------ From: Vasyl Vavrychuk <[email protected]> commit a1881c9b8a1edef0a5ae1d5c1b61406fe3402114 upstream. Otherwise if network manager starts configuring Wi-Fi interface immidiatelly after getting notification of its creation, we will get NULL pointer dereference: BUG: unable to handle kernel NULL pointer dereference at (null) IP: [<ffffffff95ae94c8>] hrtimer_active+0x28/0x50 ... Call Trace: [<ffffffff95ae9997>] ? hrtimer_try_to_cancel+0x27/0x110 [<ffffffff95ae9a95>] ? hrtimer_cancel+0x15/0x20 [<ffffffffc0803bf0>] ? mac80211_hwsim_config+0x140/0x1c0 [mac80211_hwsim] Cc: [email protected] Signed-off-by: Vasyl Vavrychuk <[email protected]> Signed-off-by: Johannes Berg <[email protected]> Signed-off-by: Greg Kroah-Hartman <[email protected]> --- drivers/net/wireless/mac80211_hwsim.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -2633,6 +2633,10 @@ static int mac80211_hwsim_new_radio(stru if (param->no_vif) ieee80211_hw_set(hw, NO_AUTO_VIF); + tasklet_hrtimer_init(&data->beacon_timer, + mac80211_hwsim_beacon, + CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + err = ieee80211_register_hw(hw); if (err < 0) { printk(KERN_DEBUG "mac80211_hwsim: ieee80211_register_hw failed (%d)\n", @@ -2657,10 +2661,6 @@ static int mac80211_hwsim_new_radio(stru data->debugfs, data, &hwsim_simulate_radar); - tasklet_hrtimer_init(&data->beacon_timer, - mac80211_hwsim_beacon, - CLOCK_MONOTONIC, HRTIMER_MODE_ABS); - spin_lock_bh(&hwsim_radio_lock); list_add_tail(&data->list, &hwsim_radios); spin_unlock_bh(&hwsim_radio_lock);
