mwl8k: prevent crash in ->configure_filter() if no interface was added

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Acked-by: Nicolas Pitre <nico@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/mwl8k.c b/drivers/net/wireless/mwl8k.c
index 25423c05aff1f245b5dd08ba947c8d153dbb1483..6e491171f73e84a180e53a7426452b2487951c76 100644 (file)
--- a/drivers/net/wireless/mwl8k.c
+++ b/drivers/net/wireless/mwl8k.c
@@ -261,7 +261,7 @@ struct mwl8k_vif {
         */
 };
 
-#define MWL8K_VIF(_vif) (struct mwl8k_vif *)(&((_vif)->drv_priv))
+#define MWL8K_VIF(_vif) ((struct mwl8k_vif *)&((_vif)->drv_priv))
 
 static const struct ieee80211_channel mwl8k_channels[] = {
        { .center_freq = 2412, .hw_value = 1, },
@@ -3219,15 +3219,19 @@ static int mwl8k_configure_filter_wt(struct work_struct *wt)
        struct dev_addr_list *mclist = worker->mclist;
 
        struct mwl8k_priv *priv = hw->priv;
-       struct mwl8k_vif *mv_vif;
        int rc = 0;
 
        if (changed_flags & FIF_BCN_PRBRESP_PROMISC) {
                if (*total_flags & FIF_BCN_PRBRESP_PROMISC)
                        rc = mwl8k_cmd_set_pre_scan(hw);
                else {
-                       mv_vif = MWL8K_VIF(priv->vif);
-                       rc = mwl8k_cmd_set_post_scan(hw, mv_vif->bssid);
+                       u8 *bssid;
+
+                       bssid = "\x00\x00\x00\x00\x00\x00";
+                       if (priv->vif != NULL)
+                               bssid = MWL8K_VIF(priv->vif)->bssid;
+
+                       rc = mwl8k_cmd_set_post_scan(hw, bssid);
                }
        }