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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>
This commit is contained in:
Amitkumar Karwar 2012-02-03 20:34:02 -08:00 committed by John W. Linville
parent 07445f6882
commit 2da8cbf8a6
2 changed files with 10 additions and 5 deletions
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3
drivers/net/wireless/mwifiex/init.c
View File

@ -382,7 +382,8 @@ mwifiex_free_adapter(struct mwifiex_adapter *adapter)
adapter->if_ops.cleanup_if(adapter);
dev_kfree_skb_any(adapter->sleep_cfm);
if (adapter->sleep_cfm)
dev_kfree_skb_any(adapter->sleep_cfm);
}
/*

12
drivers/net/wireless/mwifiex/main.c
View File

@ -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);