b43: fix invalid memory access in b43_ssb_remove()

wldev is freed in b43_one_core_detach() and should not be accessed after
that call.  Keep wldev->dev in a local variable.

Signed-off-by: Pavel Roskin <proski@gnu.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/drivers/net/wireless/b43/main.c b/drivers/net/wireless/b43/main.c
index d9f53b791b21..85d6a1f03a08 100644
--- a/drivers/net/wireless/b43/main.c
+++ b/drivers/net/wireless/b43/main.c
@@ -5350,6 +5350,7 @@ static void b43_ssb_remove(struct ssb_device *sdev)
 {
         struct b43_wl *wl = ssb_get_devtypedata(sdev);
         struct b43_wldev *wldev = ssb_get_drvdata(sdev);
+        struct b43_bus_dev *dev = wldev->dev;
 
         /* We must cancel any work here before unregistering from ieee80211,
          * as the ieee80211 unreg will destroy the workqueue. */
@@ -5365,14 +5366,14 @@ static void b43_ssb_remove(struct ssb_device *sdev)
                 ieee80211_unregister_hw(wl->hw);
         }
 
-        b43_one_core_detach(wldev->dev);
+        b43_one_core_detach(dev);
 
         if (list_empty(&wl->devlist)) {
                 b43_leds_unregister(wl);
                 /* Last core on the chip unregistered.
                  * We can destroy common struct b43_wl.
                  */
-                b43_wireless_exit(wldev->dev, wl);
+                b43_wireless_exit(dev, wl);
         }
 }