b43: Dereference of wl->current_dev must be protected by wl->mutex

Put all access to wl->current_dev under protection of the mutex.

Signed-off-by: Michael Buesch <mb@bu3sch.de>
Cc: Larry Finger <larry.finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index 1c93b4f4bfe37abd7f65b7687a945652d337ead0..9568ab17fe717e0842ccb88aefd7e1d489d93c67 100644 (file)
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -2810,18 +2810,25 @@ static int b43_dev_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                           struct ieee80211_key_conf *key)
 {
        struct b43_wl *wl = hw_to_b43_wl(hw);
-       struct b43_wldev *dev = wl->current_dev;
+       struct b43_wldev *dev;
        unsigned long flags;
        u8 algorithm;
        u8 index;
-       int err = -EINVAL;
+       int err;
        DECLARE_MAC_BUF(mac);
 
        if (modparam_nohwcrypt)
                return -ENOSPC; /* User disabled HW-crypto */
 
-       if (!dev)
-               return -ENODEV;
+       mutex_lock(&wl->mutex);
+       spin_lock_irqsave(&wl->irq_lock, flags);
+
+       dev = wl->current_dev;
+       err = -ENODEV;
+       if (!dev || b43_status(dev) < B43_STAT_INITIALIZED)
+               goto out_unlock;
+
+       err = -EINVAL;
        switch (key->alg) {
        case ALG_WEP:
                if (key->keylen == 5)
@@ -2837,20 +2844,11 @@ static int b43_dev_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
                break;
        default:
                B43_WARN_ON(1);
-               goto out;
+               goto out_unlock;
        }
-
        index = (u8) (key->keyidx);
        if (index > 3)
-               goto out;
-
-       mutex_lock(&wl->mutex);
-       spin_lock_irqsave(&wl->irq_lock, flags);
-
-       if (b43_status(dev) < B43_STAT_INITIALIZED) {
-               err = -ENODEV;
                goto out_unlock;
-       }
 
        switch (cmd) {
        case SET_KEY: