linux-kernel - [PATCH 4.17 087/336] qtnfmac: fix invalid STA state on EAPOL failure

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Date:   Wed,  1 Aug 2018 18:47:02 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>,
        Kalle Valo <kvalo@...eaurora.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.17 087/336] qtnfmac: fix invalid STA state on EAPOL failure

4.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>

[ Upstream commit 480daa9cb62c14bbd1b87a01cd9bc10cc56dbf32 ]

Driver switches vif sta_state into QTNF_STA_CONNECTING when cfg80211
core initiates connect procedure. Further this state is changed either
to QTNF_STA_CONNECTED or to QTNF_STA_DISCONNECTED by BSS_JOIN and
BSS_LEAVE events from firmware. However it is possible that no such
events will be sent by firmware, e.g. if EAPOL timed out.

In this case vif sta_mode will remain in QTNF_STA_CONNECTING state and
all subsequent connection attempts will fail with -EBUSY error code.
Fix this by perfroming STA state transition from QTNF_STA_CONNECTING
to QTNF_STA_DISCONNECTED in cfg80211 disconnect callback.
No need to rely upon firmware events in this case.

Signed-off-by: Sergey Matyukevich <sergey.matyukevich.os@...ntenna.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/wireless/quantenna/qtnfmac/cfg80211.c |   21 ++++++++++++++-------
 drivers/net/wireless/quantenna/qtnfmac/event.c    |    8 +++-----
 2 files changed, 17 insertions(+), 12 deletions(-)

--- a/drivers/net/wireless/quantenna/qtnfmac/cfg80211.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/cfg80211.c
@@ -651,28 +651,35 @@ qtnf_disconnect(struct wiphy *wiphy, str
 {
 	struct qtnf_wmac *mac = wiphy_priv(wiphy);
 	struct qtnf_vif *vif;
-	int ret;
+	int ret = 0;
 
 	vif = qtnf_mac_get_base_vif(mac);
 	if (!vif) {
 		pr_err("MAC%u: primary VIF is not configured\n", mac->macid);
-		return -EFAULT;
+		ret = -EFAULT;
+		goto out;
 	}
 
-	if (vif->wdev.iftype != NL80211_IFTYPE_STATION)
-		return -EOPNOTSUPP;
+	if (vif->wdev.iftype != NL80211_IFTYPE_STATION) {
+		ret = -EOPNOTSUPP;
+		goto out;
+	}
 
 	if (vif->sta_state == QTNF_STA_DISCONNECTED)
-		return 0;
+		goto out;
 
 	ret = qtnf_cmd_send_disconnect(vif, reason_code);
 	if (ret) {
 		pr_err("VIF%u.%u: failed to disconnect\n", mac->macid,
 		       vif->vifid);
-		return ret;
+		goto out;
 	}
 
-	return 0;
+out:
+	if (vif->sta_state == QTNF_STA_CONNECTING)
+		vif->sta_state = QTNF_STA_DISCONNECTED;
+
+	return ret;
 }
 
 static int
--- a/drivers/net/wireless/quantenna/qtnfmac/event.c
+++ b/drivers/net/wireless/quantenna/qtnfmac/event.c
@@ -198,11 +198,9 @@ qtnf_event_handle_bss_leave(struct qtnf_
 		return -EPROTO;
 	}
 
-	if (vif->sta_state != QTNF_STA_CONNECTED) {
-		pr_err("VIF%u.%u: BSS_LEAVE event when STA is not connected\n",
-		       vif->mac->macid, vif->vifid);
-		return -EPROTO;
-	}
+	if (vif->sta_state != QTNF_STA_CONNECTED)
+		pr_warn("VIF%u.%u: BSS_LEAVE event when STA is not connected\n",
+			vif->mac->macid, vif->vifid);
 
 	pr_debug("VIF%u.%u: disconnected\n", vif->mac->macid, vif->vifid);