wireless: Do not allow disabled channel in scan request

cfg80211_conn_scan allows disabled channels at scan request.
Hence probe request was seen at the disabled one. This patch
ensures that disabled channel never be added into the scan
request's channel list.

Acked-by: Johannes Berg <[email protected]>
Signed-off-by: Rajkumar Manoharan <[email protected]>
Signed-off-by: John W. Linville <[email protected]>

Author: Rajkumar Manoharan

net/wireless/sme.c

@@ -110,17 +110,22 @@ static int cfg80211_conn_scan(struct wireless_dev *wdev)
 	else {
 		int i = 0, j;
 		enum ieee80211_band band;
+		struct ieee80211_supported_band *bands;
+		struct ieee80211_channel *channel;
 
 		for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
-			if (!wdev->wiphy->bands[band])
+			bands = wdev->wiphy->bands[band];
+			if (!bands)
 				continue;
-			for (j = 0; j < wdev->wiphy->bands[band]->n_channels;
-			     i++, j++)
-				request->channels[i] =
-					&wdev->wiphy->bands[band]->channels[j];
-			request->rates[band] =
-				(1 << wdev->wiphy->bands[band]->n_bitrates) - 1;
+			for (j = 0; j < bands->n_channels; j++) {
+				channel = &bands->channels[j];
+				if (channel->flags & IEEE80211_CHAN_DISABLED)
+					continue;
+				request->channels[i++] = channel;
+			}
+			request->rates[band] = (1 << bands->n_bitrates) - 1;
 		}
+		n_channels = i;
 	}
 	request->n_channels = n_channels;
 	request->ssids = (void *)&request->channels[n_channels];