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[v2,48/65] staging: wfx: fix RCU usage

Message ID 20200115135338.14374-49-Jerome.Pouiller@silabs.com
State Superseded
Headers show
Series Simplify and improve the wfx driver | expand

Commit Message

Jérôme Pouiller Jan. 15, 2020, 1:55 p.m. UTC 
From: Jérôme Pouiller <jerome.pouiller@silabs.com>

Indeed, sta was used after call to rcu_unlock()

Signed-off-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
---
 drivers/staging/wfx/sta.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/staging/wfx/sta.c b/drivers/staging/wfx/sta.c
index 1c10ebd11944..cc72877a090f 100644
--- a/drivers/staging/wfx/sta.c
+++ b/drivers/staging/wfx/sta.c
@@ -690,10 +690,9 @@  static void wfx_join_finalize(struct wfx_vif *wvif,
 	struct ieee80211_sta *sta = NULL;
 
 	wvif->beacon_int = info->beacon_int;
-	rcu_read_lock();
+	rcu_read_lock(); // protect sta
 	if (info->bssid && !info->ibss_joined)
 		sta = ieee80211_find_sta(wvif->vif, info->bssid);
-	rcu_read_unlock();
 	if (sta)
 		wvif->bss_params.operational_rate_set =
 			wfx_rate_mask_to_hw(wvif->wdev, sta->supp_rates[wvif->channel->band]);
@@ -712,6 +711,7 @@  static void wfx_join_finalize(struct wfx_vif *wvif,
 	wvif->bss_params.aid = info->aid;
 
 	hif_set_association_mode(wvif, info, sta ? &sta->ht_cap : NULL);
+	rcu_read_unlock();
 
 	if (!info->ibss_joined) {
 		hif_keep_alive_period(wvif, 30 /* sec */);