redonkable/alistair23-linux
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staging: wfx: fix potential dead lock between join and scan

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The device disallows to start a scan request between hif_join() and
hif_set_bss_params(). The driver is not protected against that. The
worst case happens when association is aborted and hif_set_bss_params()
never happens.

mac80211 would never ask for scan during the association process. So,
this patch just aborts the association in progress when scan is
requested.

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/20200515083325.378539-14-Jerome.Pouiller@silabs.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jérôme Pouiller 2020-05-15 10:33:19 +02:00 committed by Greg Kroah-Hartman
parent b3a71adf4d
commit f214b7b6e7
3 changed files with 10 additions and 0 deletions
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5
drivers/staging/wfx/scan.c
View file

@ -88,6 +88,11 @@ void wfx_hw_scan_work(struct work_struct *work)
mutex_lock(&wvif->wdev->conf_mutex);
mutex_lock(&wvif->scan_lock);
if (wvif->join_in_progress) {
dev_info(wvif->wdev->dev, "%s: abort in-progress REQ_JOIN",
__func__);
wfx_reset(wvif);
}
update_probe_tmpl(wvif, &hw_req->req);
chan_cur = 0;
do {

3
drivers/staging/wfx/sta.c
View file

@ -353,6 +353,7 @@ void wfx_reset(struct wfx_vif *wvif)
if (wvif_count(wvif->wdev) <= 1)
hif_set_block_ack_policy(wvif, 0xFF, 0xFF);
wfx_tx_unlock(wvif->wdev);
wvif->join_in_progress = false;
wvif->bss_not_support_ps_poll = false;
cancel_delayed_work_sync(&wvif->beacon_loss_work);
}
@ -390,6 +391,7 @@ static void wfx_do_join(struct wfx_vif *wvif)
wfx_set_mfp(wvif, bss);
cfg80211_put_bss(wvif->wdev->hw->wiphy, bss);
wvif->join_in_progress = true;
ret = hif_join(wvif, conf, wvif->channel, ssid, ssidlen);
if (ret) {
ieee80211_connection_loss(wvif->vif);
@ -485,6 +487,7 @@ void wfx_stop_ap(struct ieee80211_hw *hw, struct ieee80211_vif *vif)
static void wfx_join_finalize(struct wfx_vif *wvif,
struct ieee80211_bss_conf *info)
{
wvif->join_in_progress = false;
hif_set_association_mode(wvif, info);
hif_keep_alive_period(wvif, 0);
// beacon_loss_count is defined to 7 in net/mac80211/mlme.c. Let's use

2
drivers/staging/wfx/wfx.h
View file

@ -69,6 +69,8 @@ struct wfx_vif {
u32 link_id_map;
bool after_dtim_tx_allowed;
bool join_in_progress;
struct delayed_work beacon_loss_work;
struct tx_policy_cache tx_policy_cache;