netdev - [PATCH AUTOSEL 5.5 06/35] iwlwifi: mvm: take the required lock when clearing time event data

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Date:   Mon,  6 Apr 2020 20:00:28 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Avraham Stern <avraham.stern@...el.com>,
        Luca Coelho <luciano.coelho@...el.com>,
        Sasha Levin <sashal@...nel.org>,
        linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.5 06/35] iwlwifi: mvm: take the required lock when clearing time event data

From: Avraham Stern <avraham.stern@...el.com>

[ Upstream commit 089e5016d7eb063712063670e6da7c1a4de1a5c1 ]

When receiving a session protection end notification, the time event
data is cleared without holding the required lock. Fix it.

Signed-off-by: Avraham Stern <avraham.stern@...el.com>
Signed-off-by: Luca Coelho <luciano.coelho@...el.com>
Link: https://lore.kernel.org/r/iwlwifi.20200306151128.a49846a634e4.Id1ada7c5a964f5e25f4d0eacc2c4b050015b46a2@changeid
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/net/wireless/intel/iwlwifi/mvm/time-event.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c b/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c
index c0b420fe5e48f..1babc4bb5194b 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/time-event.c
@@ -785,7 +785,9 @@ void iwl_mvm_rx_session_protect_notif(struct iwl_mvm *mvm,
 		if (!le32_to_cpu(notif->status)) {
 			iwl_mvm_te_check_disconnect(mvm, vif,
 						    "Session protection failure");
+			spin_lock_bh(&mvm->time_event_lock);
 			iwl_mvm_te_clear_data(mvm, te_data);
+			spin_unlock_bh(&mvm->time_event_lock);
 		}
 
 		if (le32_to_cpu(notif->start)) {
@@ -801,7 +803,9 @@ void iwl_mvm_rx_session_protect_notif(struct iwl_mvm *mvm,
 			 */
 			iwl_mvm_te_check_disconnect(mvm, vif,
 						    "No beacon heard and the session protection is over already...");
+			spin_lock_bh(&mvm->time_event_lock);
 			iwl_mvm_te_clear_data(mvm, te_data);
+			spin_unlock_bh(&mvm->time_event_lock);
 		}
 
 		goto out_unlock;
-- 
2.20.1