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[PATCHv5] mac80211: fix NULL pointer dereference in ieee80211_compatible_rates

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Fix a possible NULL pointer dereference in ieee80211_compatible_rates
introduced in the patch "mac80211: fix association with some APs". If no bss
is available just use all supported rates in the association request.

Signed-off-by: Helmut Schaa <hschaa@xxxxxxx>
---

diff --git a/net/mac80211/mlme.c b/net/mac80211/mlme.c
index 76ad4ed..3f7f92a 100644
--- a/net/mac80211/mlme.c
+++ b/net/mac80211/mlme.c
@@ -721,7 +721,17 @@ static void ieee80211_send_assoc(struct net_device *dev,
 			capab |= WLAN_CAPABILITY_PRIVACY;
 		if (bss->wmm_ie)
 			wmm = 1;
+
+		/* get all rates supported by the device and the AP as
+		 * some APs don't like getting a superset of their rates
+		 * in the association request (e.g. D-Link DAP 1353 in
+		 * b-only mode) */
+		rates_len = ieee80211_compatible_rates(bss, sband, &rates);
+
 		ieee80211_rx_bss_put(dev, bss);
+	} else {
+		rates = ~0;
+		rates_len = sband->n_bitrates;
 	}

 	mgmt = (struct ieee80211_mgmt *) skb_put(skb, 24);
@@ -752,10 +762,7 @@ static void ieee80211_send_assoc(struct net_device *dev,
 	*pos++ = ifsta->ssid_len;
 	memcpy(pos, ifsta->ssid, ifsta->ssid_len);

-	/* all supported rates should be added here but some APs
-	 * (e.g. D-Link DAP 1353 in b-only mode) don't like that
-	 * Therefore only add rates the AP supports */
-	rates_len = ieee80211_compatible_rates(bss, sband, &rates);
+	/* add all rates which were marked to be used above */
 	supp_rates_len = rates_len;
 	if (supp_rates_len > 8)
 		supp_rates_len = 8;

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