mwifiex: avoid storing random_mac in private

Application will keep track of whether MAC address randomization
is enabled or not during scan. But at present driver is storing
'random_mac' in mwifiex_private which implies even after scan is
done driver has some reference to the earlier 'scan request'. To
avoid this, make use of 'mac_addr' variable in 'scan_request' to
store 'random_mac'. This structure will be freed by cfg80211 once
scan is done.
Signed-off-by: Ganapathi Bhat <gbhat@marvell.com>
Reviewed-by: Brian Norris <briannorris@chromium.org>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/marvell/mwifiex/cfg80211.c

@@ -2529,15 +2529,12 @@ mwifiex_cfg80211_scan(struct wiphy *wiphy,
 	priv->scan_request = request;
 
 	if (request->flags & NL80211_SCAN_FLAG_RANDOM_ADDR) {
-		ether_addr_copy(priv->random_mac, request->mac_addr);
 		for (i = 0; i < ETH_ALEN; i++) {
-			priv->random_mac[i] &= request->mac_addr_mask[i];
-			priv->random_mac[i] |= get_random_int() &
-					       ~(request->mac_addr_mask[i]);
+			request->mac_addr[i] &= request->mac_addr_mask[i];
+			request->mac_addr[i] |=
+				get_random_int() & ~(request->mac_addr_mask[i]);
 		}
-		ether_addr_copy(user_scan_cfg->random_mac, priv->random_mac);
-	} else {
-		eth_zero_addr(priv->random_mac);
+		ether_addr_copy(user_scan_cfg->random_mac, request->mac_addr);
 	}
 
 	user_scan_cfg->num_ssids = request->n_ssids;

drivers/net/wireless/marvell/mwifiex/main.h

@@ -680,7 +680,6 @@ struct mwifiex_private {
 	struct mwifiex_user_scan_chan hidden_chan[MWIFIEX_USER_SCAN_CHAN_MAX];
 	u8 assoc_resp_ht_param;
 	bool ht_param_present;
-	u8 random_mac[ETH_ALEN];
 };
 
 

drivers/net/wireless/marvell/mwifiex/scan.c

@@ -1946,7 +1946,8 @@ mwifiex_active_scan_req_for_passive_chan(struct mwifiex_private *priv)
 
 	adapter->active_scan_triggered = true;
 	if (priv->scan_request->flags & NL80211_SCAN_FLAG_RANDOM_ADDR)
-		ether_addr_copy(user_scan_cfg->random_mac, priv->random_mac);
+		ether_addr_copy(user_scan_cfg->random_mac,
+				priv->scan_request->mac_addr);
 	user_scan_cfg->num_ssids = priv->scan_request->n_ssids;
 	user_scan_cfg->ssid_list = priv->scan_request->ssids;