mwifiex: add NULL checks in driver unload path

If driver load is failed, sometimes few pointers may remain
uninitialized ex. priv->wdev, priv->netdev, adapter->sleep_cfm
This will cause NULL pointer dereferance while unloading the
driver.

Signed-off-by: Amitkumar Karwar <akarwar@marvell.com>
Signed-off-by: Kiran Divekar <dkiran@marvell.com>
Signed-off-by: Bing Zhao <bzhao@marvell.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/net/wireless/mwifiex/main.c b/drivers/net/wireless/mwifiex/main.c
index 84be196188cc..b728f54451e4 100644
--- a/drivers/net/wireless/mwifiex/main.c
+++ b/drivers/net/wireless/mwifiex/main.c
@@ -822,7 +822,9 @@ int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
                         continue;
 
                 rtnl_lock();
-                mwifiex_del_virtual_intf(priv->wdev->wiphy, priv->netdev);
+                if (priv->wdev && priv->netdev)
+                        mwifiex_del_virtual_intf(priv->wdev->wiphy,
+                                                 priv->netdev);
                 rtnl_unlock();
         }
 
@@ -830,9 +832,11 @@ int mwifiex_remove_card(struct mwifiex_adapter *adapter, struct semaphore *sem)
         if (!priv)
                 goto exit_remove;
 
-        wiphy_unregister(priv->wdev->wiphy);
-        wiphy_free(priv->wdev->wiphy);
-        kfree(priv->wdev);
+        if (priv->wdev) {
+                wiphy_unregister(priv->wdev->wiphy);
+                wiphy_free(priv->wdev->wiphy);
+                kfree(priv->wdev);
+        }
 
         mwifiex_terminate_workqueue(adapter);