wifi: rtw88: prevent scan abort with other VIFs

Only abort scan with current scanning VIF. If we have more than one
interface, we could call rtw_hw_scan_abort() with the wrong VIF as
input. This avoids potential null pointer being accessed when actually
the other VIF is scanning.

Signed-off-by: Po-Hao Huang <phhuang@realtek.com>
Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230414121312.17954-1-pkshih@realtek.com

Author: Po-Hao Huang

drivers/net/wireless/realtek/rtw88/fw.c

@@ -2163,8 +2163,10 @@ int rtw_hw_scan_offload(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
 	return ret;
 }
 
-void rtw_hw_scan_abort(struct rtw_dev *rtwdev, struct ieee80211_vif *vif)
+void rtw_hw_scan_abort(struct rtw_dev *rtwdev)
 {
+	struct ieee80211_vif *vif = rtwdev->scan_info.scanning_vif;
+
 	if (!rtw_fw_feature_check(&rtwdev->fw, FW_FEATURE_SCAN_OFFLOAD))
 		return;
 

drivers/net/wireless/realtek/rtw88/fw.h

@@ -868,5 +868,5 @@ int rtw_hw_scan_offload(struct rtw_dev *rtwdev, struct ieee80211_vif *vif,
 			bool enable);
 void rtw_hw_scan_status_report(struct rtw_dev *rtwdev, struct sk_buff *skb);
 void rtw_hw_scan_chan_switch(struct rtw_dev *rtwdev, struct sk_buff *skb);
-void rtw_hw_scan_abort(struct rtw_dev *rtwdev, struct ieee80211_vif *vif);
+void rtw_hw_scan_abort(struct rtw_dev *rtwdev);
 #endif

drivers/net/wireless/realtek/rtw88/mac80211.c

@@ -393,7 +393,8 @@ static void rtw_ops_bss_info_changed(struct ieee80211_hw *hw,
 			 * when disconnected by peer
 			 */
 			if (test_bit(RTW_FLAG_SCANNING, rtwdev->flags))
-				rtw_hw_scan_abort(rtwdev, vif);
+				rtw_hw_scan_abort(rtwdev);
+
 		}
 
 		config |= PORT_SET_NET_TYPE;
@@ -870,7 +871,7 @@ static int rtw_ops_hw_scan(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
 	rtw_hw_scan_start(rtwdev, vif, req);
 	ret = rtw_hw_scan_offload(rtwdev, vif, true);
 	if (ret) {
-		rtw_hw_scan_abort(rtwdev, vif);
+		rtw_hw_scan_abort(rtwdev);
 		rtw_err(rtwdev, "HW scan failed with status: %d\n", ret);
 	}
 	mutex_unlock(&rtwdev->mutex);
@@ -890,7 +891,7 @@ static void rtw_ops_cancel_hw_scan(struct ieee80211_hw *hw,
 		return;
 
 	mutex_lock(&rtwdev->mutex);
-	rtw_hw_scan_abort(rtwdev, vif);
+	rtw_hw_scan_abort(rtwdev);
 	mutex_unlock(&rtwdev->mutex);
 }