[Xenial][PATCH v2 3/3] mwifiex: cfg80211: do not change virtual interface during scan processing

[Wen-chien Jesse Sung]

From: Limin Zhu <liminzhu at marvell.com>

BugLink: https://launchpad.net/bugs/1769671

(1) Change virtual interface operation in cfg80211 process reset and
reinitilize private data structure.
(2) Scan result event processed in main process will dereference private
data structure concurrently, ocassionly crash the kernel.

The cornel case could be trigger by below steps:
(1) wpa_cli mlan0 scan
(2) ./hostapd mlan0.conf

Cfg80211 asynchronous scan procedure is not all the time operated
under rtnl lock, here we add the protect to serialize the cfg80211
scan and change_virtual interface operation.

Signed-off-by: Limin Zhu <liminzhu at marvell.com>
Signed-off-by: Xinming Hu <huxm at marvell.com>
Signed-off-by: Kalle Valo <kvalo at codeaurora.org>
(backported from commit c61cfe49f0f0f0d1f8b56d0b045838d597e8c3a3)
Signed-off-by: Wen-chien Jesse Sung <jesse.sung at canonical.com>
---
 drivers/net/wireless/mwifiex/cfg80211.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/wireless/mwifiex/cfg80211.c b/drivers/net/wireless/mwifiex/cfg80211.c
index cc50ca67cca9..1d35c227df52 100644
--- a/drivers/net/wireless/mwifiex/cfg80211.c
+++ b/drivers/net/wireless/mwifiex/cfg80211.c
@@ -1056,6 +1056,12 @@ mwifiex_cfg80211_change_virtual_intf(struct wiphy *wiphy,
 	struct mwifiex_private *priv = mwifiex_netdev_get_priv(dev);
 	enum nl80211_iftype curr_iftype = dev->ieee80211_ptr->iftype;
 
+	if (priv->scan_request) {
+		mwifiex_dbg(priv->adapter, ERROR,
+			    "change virtual interface: scan in process\n");
+		return -EBUSY;
+	}
+
 	switch (curr_iftype) {
 	case NL80211_IFTYPE_ADHOC:
 		switch (type) {
-- 
2.17.0