4.4-stable review patch. If anyone has any objections, please let me know.
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From: Vasyl Vavrychuk vasyl.vavrychuk@globallogic.com
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: stable@vger.kernel.org Signed-off-by: Vasyl Vavrychuk vasyl.vavrychuk@globallogic.com Signed-off-by: Johannes Berg johannes.berg@intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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 @@ -2515,6 +2515,10 @@ 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", @@ -2539,10 +2543,6 @@ 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);