[patch 22/23] mac80211: only honor IW_SCAN_THIS_ESSID in STA, IBSS, and AP modes

[Greg KH <gregkh@suse.de>]

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

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


From: John W. Linville <linville@tuxdriver.com>

patch d114f399b4da6fa7f9da3bbf1fb841370c11e788 in mainline.

The previous IW_SCAN_THIS_ESSID patch left a hole allowing scan
requests on interfaces in inappropriate modes.

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
 net/mac80211/ieee80211_ioctl.c |   37 +++++++++++++++++++------------------
 1 file changed, 19 insertions(+), 18 deletions(-)

--- a/net/mac80211/ieee80211_ioctl.c
+++ b/net/mac80211/ieee80211_ioctl.c
@@ -698,29 +698,30 @@ static int ieee80211_ioctl_siwscan(struc
 	if (!netif_running(dev))
 		return -ENETDOWN;
 
+	switch (sdata->type) {
+	case IEEE80211_IF_TYPE_STA:
+	case IEEE80211_IF_TYPE_IBSS:
+		if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
+			ssid = sdata->u.sta.ssid;
+			ssid_len = sdata->u.sta.ssid_len;
+		}
+		break;
+	case IEEE80211_IF_TYPE_AP:
+		if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
+			ssid = sdata->u.ap.ssid;
+			ssid_len = sdata->u.ap.ssid_len;
+		}
+		break;
+	default:
+		return -EOPNOTSUPP;
+	}
+
+	/* if SSID was specified explicitly then use that */
 	if (wrqu->data.length == sizeof(struct iw_scan_req) &&
 	    wrqu->data.flags & IW_SCAN_THIS_ESSID) {
 		req = (struct iw_scan_req *)extra;
 		ssid = req->essid;
 		ssid_len = req->essid_len;
-	} else {
-		switch (sdata->type) {
-		case IEEE80211_IF_TYPE_STA:
-		case IEEE80211_IF_TYPE_IBSS:
-			if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
-				ssid = sdata->u.sta.ssid;
-				ssid_len = sdata->u.sta.ssid_len;
-			}
-			break;
-		case IEEE80211_IF_TYPE_AP:
-			if (local->scan_flags & IEEE80211_SCAN_MATCH_SSID) {
-				ssid = sdata->u.ap.ssid;
-				ssid_len = sdata->u.ap.ssid_len;
-			}
-			break;
-		default:
-			return -EOPNOTSUPP;
-		}
 	}
 
 	return ieee80211_sta_req_scan(dev, ssid, ssid_len);

--