cfg80211: fix SME connect

There's a check saying
	/* we're good if we have both BSSID and channel */
	if (wdev->conn->params.bssid && wdev->conn->params.channel) {

but that isn't true -- we need the BSS struct. This leads
to errors such as

    Trying to associate with 00:1b:53:11:dc:40 (SSID='TEST' freq=2412 MHz)
    ioctl[SIOCSIWFREQ]: No such file or directory
    ioctl[SIOCSIWESSID]: No such file or directory
    Association request to the driver failed
    Associated with 00:1b:53:11:dc:40

in wpa_supplicant, as reported by Holger.

Instead, we really need to have the BSS struct, and if we
don't, then we need to initiate a scan for it. But we may
already have the BSS struct here, so hang on to it if we
do and scan if we don't.

Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Tested-by: Holger Schurig <hs4233@mail.mn-solutions.de>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 13 insertions, 8 deletions

diff --git a/net/wireless/sme.c b/net/wireless/sme.c
index 68307883ec87..7fae7eee65de 100644
--- a/net/wireless/sme.c
+++ b/net/wireless/sme.c
@@ -188,7 +188,7 @@ void cfg80211_conn_work(struct work_struct *work)
         rtnl_unlock();
 }
 
-static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
+static struct cfg80211_bss *cfg80211_get_conn_bss(struct wireless_dev *wdev)
 {
         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
         struct cfg80211_bss *bss;
@@ -205,7 +205,7 @@ static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
                                WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_PRIVACY,
                                capa);
         if (!bss)
-                return false;
+                return NULL;
 
         memcpy(wdev->conn->bssid, bss->bssid, ETH_ALEN);
         wdev->conn->params.bssid = wdev->conn->bssid;
@@ -213,14 +213,14 @@ static bool cfg80211_get_conn_bss(struct wireless_dev *wdev)
         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
         schedule_work(&rdev->conn_work);
 
-        cfg80211_put_bss(bss);
-        return true;
+        return bss;
 }
 
 static void __cfg80211_sme_scan_done(struct net_device *dev)
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct cfg80211_registered_device *rdev = wiphy_to_dev(wdev->wiphy);
+        struct cfg80211_bss *bss;
 
         ASSERT_WDEV_LOCK(wdev);
 
@@ -234,7 +234,10 @@ static void __cfg80211_sme_scan_done(struct net_device *dev)
             wdev->conn->state != CFG80211_CONN_SCAN_AGAIN)
                 return;
 
-        if (!cfg80211_get_conn_bss(wdev)) {
+        bss = cfg80211_get_conn_bss(wdev);
+        if (bss) {
+                cfg80211_put_bss(bss);
+        } else {
                 /* not found */
                 if (wdev->conn->state == CFG80211_CONN_SCAN_AGAIN)
                         schedule_work(&rdev->conn_work);
@@ -670,6 +673,7 @@ int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 {
         struct wireless_dev *wdev = dev->ieee80211_ptr;
         struct ieee80211_channel *chan;
+        struct cfg80211_bss *bss = NULL;
         int err;
 
         ASSERT_WDEV_LOCK(wdev);
@@ -760,7 +764,7 @@ int __cfg80211_connect(struct cfg80211_registered_device *rdev,
 
                 /* don't care about result -- but fill bssid & channel */
                 if (!wdev->conn->params.bssid || !wdev->conn->params.channel)
-                        cfg80211_get_conn_bss(wdev);
+                        bss = cfg80211_get_conn_bss(wdev);
 
                 wdev->sme_state = CFG80211_SME_CONNECTING;
                 wdev->connect_keys = connkeys;
@@ -770,10 +774,11 @@ int __cfg80211_connect(struct cfg80211_registered_device *rdev,
                         wdev->conn->prev_bssid_valid = true;
                 }
 
-                /* we're good if we have both BSSID and channel */
-                if (wdev->conn->params.bssid && wdev->conn->params.channel) {
+                /* we're good if we have a matching bss struct */
+                if (bss) {
                         wdev->conn->state = CFG80211_CONN_AUTHENTICATE_NEXT;
                         err = cfg80211_conn_do_work(wdev);
+                        cfg80211_put_bss(bss);
                 } else {
                         /* otherwise we'll need to scan for the AP first */
                         err = cfg80211_conn_scan(wdev);