diff options
| author | Vasyl Vavrychuk <vasyl.vavrychuk@globallogic.com> | 2018-10-18 01:02:12 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-12-13 09:16:22 +0100 |
| commit | daac338a9e7bbdd89fae6f29314803192ffce921 (patch) | |
| tree | 259e7161aa46d7e88e53815339b25ca8b46d7807 /drivers/net/wireless | |
| parent | d66c1b9280d146f8b2215224ca42535d8ab1fb39 (diff) | |
mac80211_hwsim: Timer should be initialized before device registered
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>
Diffstat (limited to 'drivers/net/wireless')
| -rw-r--r-- | drivers/net/wireless/mac80211_hwsim.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/net/wireless/mac80211_hwsim.c b/drivers/net/wireless/mac80211_hwsim.c index 07442ada6dd0..62ab42e94c9d 100644 --- a/drivers/net/wireless/mac80211_hwsim.c +++ b/drivers/net/wireless/mac80211_hwsim.c @@ -2889,6 +2889,10 @@ static int mac80211_hwsim_new_radio(struct genl_info *info, wiphy_ext_feature_set(hw->wiphy, NL80211_EXT_FEATURE_CQM_RSSI_LIST); + tasklet_hrtimer_init(&data->beacon_timer, + mac80211_hwsim_beacon, + CLOCK_MONOTONIC, HRTIMER_MODE_ABS); + err = ieee80211_register_hw(hw); if (err < 0) { pr_debug("mac80211_hwsim: ieee80211_register_hw failed (%d)\n", @@ -2913,10 +2917,6 @@ static int mac80211_hwsim_new_radio(struct genl_info *info, 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); err = rhashtable_insert_fast(&hwsim_radios_rht, &data->rht, hwsim_rht_params); |